51704960_181910046_BGM_Maple G1_Textbook Integrated_Term1_text

Example 3: Some objects are given here. Draw and name the outlines of their bases. Object Outline Name of the base of the base Circle Triangle Rectangle Circle Square Shapes 7 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 51 2/16/2018 2:47:11 PM

Higher Order Thinking Skills (H.O.T.S.) Let us try to identify the different solids through an example. Example 4: Observe the given picture and answer the questions that follow. a) H ow many cubes are there? Colour them blue. b) How many cuboids are there? Colour them red. c) How many cones are there? Colour them yellow. d) Name the solid figure shown: Colour them brown. e) How many are there in the given picture? Colour them Solution: green. c) 2 d) Cylinder e) 2 a) 3 b) 4 2/16/2018 2:47:11 PM 8 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 52

Drill Time Concept 1.1: Understand Spatial Words 1) Where is the dragon with respect to the box in the given pictures? a) b) c) d) e) f) 2) Complete the following table. Object Name of the solid Object Name of the solid figure figure Shapes 9 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 53 2/16/2018 2:47:11 PM

3) Circle the words that tell the position of the cat with respect to the ball. One is done for you. h y pmy z d x i c z c j y f l gmh i k x eqbe l own a b o v e wm s x f f ebp t d j g s r e h o y wp z l mo m i nmew j f z n on z pegqc k t ed l unde r do h t r h j ad t a f 4) Complete the following table. Object Shape of the base Name of the figure formed 10 2/16/2018 2:47:11 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 54

Object Shape of the base Name of the figure formed Shapes 11 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 55 2/16/2018 2:47:11 PM

Chapter Patterns 2 Let Us Learn About • patterns in shapes. • patterns in numbers. Concept 2.1: Patterns in Surrounding Think Bantei found paper cuttings of different shapes and sizes. He arranged the pieces in different ways and made many designs. Do you know how to make a design? Recall We see many things around us. They all have different sizes, shapes and colours. 12 2/16/2018 2:47:11 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 56

Recall the flat and solid shapes that we have already learnt. Different shapes are given in this table. Write their names. One is done for you. Figure Name Example Triangle Patterns 13 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 57 2/16/2018 2:47:11 PM

Figure Name Example & Remembering and Understanding Observe the following pictures. a) b) c) d) From the given pictures, we observe that: a) same shapes of different sizes and colours are arranged alternately. b) different shapes of different colours are arranged alternately. c) and d) same shapes of the same size but of different colours are arranged as a group. 14 2/16/2018 2:47:11 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 58

In all these, we observe that the groups repeat many times. Repetition of basic shapes is called a pattern. Let us see a few examples of patterns. Example 1: Observe the colours of the balloons and complete the pattern. Solution: T here are balloons of two colours: pink and purple. They are arranged alternately. So, the pattern formed by these balloons is shown below. Example 2: Complete the following patterns. One is done for you. a) b) c) d) Patterns 15 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 59 2/16/2018 2:47:11 PM

Try this! Colour the given pictures according to the pattern. a) b) c) Application Let us now see some more patterns. Example 3: Tick the picture that comes next in these patterns. One is done for you. Pattern Next picture  16 2/16/2018 2:47:11 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 60

Pattern Next picture Example 4: Circle the figure that does not belong to each of the patterns given. One is done for you. a) b) c) d) Patterns 17 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 61 2/16/2018 2:47:11 PM

Patterns can also be seen in numbers as shown. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Higher Order Thinking Skills (H.O.T.S.) We see patterns on roofs of buildings and monuments. We also see them on floor tiles, saree borders, dresses, grills and so on. Patterns on floor tiles Patterns on roofs of monuments Patterns on saree borders 18 2/16/2018 2:47:11 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 62

Patterns on doors Patterns on grills Example 5: Complete the given patterns. One is done for you. a) 10 20 30 40 50 60 70 b) 2 4 6 8 _____ 12 ____ c) 14 13 12 ____ 10 _____ 8 Patterns 19 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 63 2/16/2018 2:47:11 PM

Drill Time Concept 2.1: Patterns in Surrounding 1) Observe these patterns. Colour the pictures to complete them. a) b) c) d) 2) Observe and complete these patterns. a) _________ _________ _________ b) ________ _________ ________ c) _______ _______ _______ d) _______ _______ ______ 20 2/16/2018 2:47:11 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 64

3) Continue the pattern by colouring the correct boxes. 9 10 12345678 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Patterns 21 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 65 2/16/2018 2:47:11 PM

Chapter Numbers 3 Let Us Learn About • the concept of zero. • the sequence of numbers up to 99. • place value and face value of numbers. • writing number names. • comparing, ordering and forming numbers. Concept 3.1: Count in Ones and Tens Think Bantei has five sticks. He counted them one by one. His father gave him more sticks to count. Is it easy to count them one by one? Is there an easier way? Recall We have learnt to count objects and write their numbers. 22 2/16/2018 2:47:11 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 66

Counting by 1s The numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 are called 1-digit numbers. They are also called single digit numbers. Colour the picture given. Use the colours as given for the numbers. 1 (One) 2 (Two) 3 (Three) 4 (Four) 5 (Five) 6 (Six) 7 (Seven) 8 (Eight) 9 (Nine) Numbers 23 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 67 2/16/2018 2:47:12 PM

& Remembering and Understanding There are 5 ducks in a pond. They flew away one by one. At last, there are no ducks in the pond. Let us learn to represent this using a number. Introducing ‘0’ 1 duck flew away. 2 ducks flew away. 4 ducks are in the pond. 3 ducks are in the pond. 3 ducks flew away. 4 ducks flew away. 2 ducks are in the pond. 1 duck is in the pond. All ducks flew away. So, there are ‘zero’ ducks in the No ducks are in the pond. pond. 24 If there are no objects, we write it as zero (0). NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 68 2/16/2018 2:47:12 PM

Example 1: Count the number of animals. Write the numbers in the boxes. One is done for you. Animals Numbers 4 Counting by 10s Let us say shows 1. Ten such boxes show a 10. So, = 10 ones = 1 ten Counting is easy if we group things into bundles of ten. We can make such collections of 10 with different things. 1 ten of balls 1 ten of books 1 ten of logs NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 69 Numbers 25 2/16/2018 2:47:12 PM

Suppose we are given 34 logs of wood to count. First, we count 10 logs and make a bundle. So, one bundle has ten wooden logs. With 34 logs, we can make 3 bundles. 3 tens (written as 30) 4 ones Thus, 4 logs of wood remain. We count these remaining logs in ones. The total number of wooden logs can be written as 3 tens and 4 ones. The number 34 has two digits. So, we use the Place Value Chart tens (T) and the ones (O) places for two digits. Thus, we write the number 34 in a place value Places Tens (T) Ones (O) chart as shown. Values 3 4 Each digit has its place and place value in the place value chart. Abacus counting We can show 2-digit numbers using an abacus. Let us show the number 9 using a spike abacus. TO TO TO One shows the We show a digit in the number 1. ones place with a blue bead. See Fig. (a). Nine in the ones spike show the 9 blue beads show 9 in number 9. the ones place. Each spike of an abacus can One shows the have only 9 beads. number 10. Fig. (a) Fig. (b) See Fig. (b). To show the number 10, we remove all the blue beads. We then put 1 green bead in the tens spike. The tens spike represents the tens place. Let us show the number 34 using a spike abacus. We put 3 green beads in the tens spike. We then put 4 blue beads in the ones spike. In the same way, we can show the numbers 46 and 99 on the abacus. So, 34 is 3 tens and 4 ones, 46 is 4 tens and 6 ones and 99 is 9 tens and 9 ones. 26 2/16/2018 2:47:12 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 70

TO TO TO shows 34 shows 46 shows 99 Number names Let us now learn the number names from 10 to 99. 10 ― Ten 20 ― Twenty 30 ― Thirty 11 ― Eleven 21 ― Twenty-one 31 ― Thirty-one 12 ― Twelve 22 ― Twenty-two 32 ― Thirty-two 13 ― Thirteen 23 ― Twenty-three 33 ― Thirty-three 14 ― Fourteen 24 ― Twenty-four 34 ― Thirty-four 15 ― Fifteen 25 ― Twenty-five 35 ― Thirty-five 16 ― Sixteen 26 ― Twenty-six 36 ― Thirty-six 17 ― Seventeen 27 ― Twenty-seven 37 ― Thirty-seven 18 ― Eighteen 28 ― Twenty-eight 38 ― Thirty-eight 19 ― Nineteen 29 ― Twenty-nine 39 ― Thirty-nine 40 ― Forty 50 ― Fifty 60 ― Sixty 41 ― Forty-one 51 ― Fifty-one 61 ― Sixty-one 42 ― Forty-two 52 ― Fifty-two 62 ― Sixty-two 43 ― Forty-three 53 ― Fifty-three 63 ― Sixty-three 44 ― Forty-four 54 ― Fifty-four 64 ― Sixty-four 45 ― Forty-five 55 ― Fifty-five 65 ― Sixty-five 46 ― Forty-six 56 ― Fifty-six 66 ― Sixty-six 47 ― Forty-seven 57 ― Fifty-seven 67 ― Sixty-seven 48 ― Forty-eight 58 ― Fifty-eight 68 ― Sixty-eight 49 ― Forty-nine 59 ― Fifty-nine 69 ― Sixty-nine Numbers 27 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 71 2/16/2018 2:47:12 PM

70 ― Seventy 80 ― Eighty 90 ― Ninety 71 ― Seventy-one 81 ― Eighty-one 91 ― Ninety-one 72 ― Seventy-two 82 ― Eighty-two 92 ― Ninety-two 73 ― Seventy-three 83 ― Eighty-three 93 ― Ninety-three 74 ― Seventy-four 84 ― Eighty-four 94 ― Ninety-four 75 ― Seventy-five 85 ― Eighty-five 95 ― Ninety-five 76 ― Seventy-six 86 ― Eighty-six 96 ― Ninety-six 77 ― Seventy-seven 87 ― Eighty-seven 97 ― Ninety-seven 78 ― Seventy-eight 88 ― Eighty-eight 98 ― Ninety-eight 79 ― Seventy-nine 89 ― Eighty-nine 99 ― Ninety-nine Let us see a few examples. Example 2: Count the number of objects. Write the number and its number name. Solution: The numbers and the number names of the objects are: Objects Number and number name 32 a) Thirty-two 17 b) Seventeen 61 c) Sixty-one 28 2/16/2018 2:47:12 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 72

Example 3: W rite the places for each of the given numbers. Then, show them on a spike abacus. a) 13 b) 29 c) 64 Solution: Number T O a) 13 1 3 b) 29 2 9 c) 64 6 4 TO TO TO a) 13 b) 29 c) 64 Application We can form a number when the place values of its digits are given. Let us see a few examples. Example 4: A number has 1 in the tens place and 4 in the ones place. What is the number? Solution: Write the given digits in the place value chart as T O shown. 14 So, the number is 14. Example 5: Form using the following numbers. a) 3 in the tens place; 7 in the ones place b) 6 in the tens place; 0 in the ones place Solution: To form the numbers, write the digits in the place value chart as shown. a) T O b) T O 37 60 So, the numbers are 37 and 60. Numbers 29 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 73 2/16/2018 2:47:12 PM

Example 6: There are four groups for a drama competition. Each group has a few students as shown. Group A Group B Group C Group D a) C ount the number of students in Group B. Write its number name. b) C ount the number of students in Group C. Write its number Solution: name. a) There are 10 students in Group B. Its number name is ten. b) T here are 19 students in Group C. Its number name is nineteen. Higher Order Thinking Skills (H.O.T.S.) Let us see a few examples of 2-digit numbers on an abacus. Example 7: Write the numbers shown on the abacuses. a) b) c) TO TO TO 30 2/16/2018 2:47:12 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 74

Solution: Count the number of beads in each spike. Write it in the place value chart. Put a 0 in the places where there are no beads. T O Number a) 3 2 32 b) 3 0 30 c) 2 3 23 Example 8: Draw beads on abacus to show the given numbers. Solution: a) 78 b) 25 c) 39 Write the digits in the place value chart. TO a) 7 8 b) 2 5 c) 3 9 Draw as many green beads as the tens digit. Draw as many blue beads as the ones digit. a) b) c) TO TO TO Numbers 31 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 75 2/16/2018 2:47:12 PM

Concept 3.2: Compare 2-digit Numbers Think Bantei has 59 marbles and his sister has 95 marbles. How will they know who has more marbles? Recall Observe the given picture. It shows cars of different colours. The red car is before The blue car is The black car is the blue car. between the red and after the blue car. the black cars. The words before, after and between give the positions of a car. In the same way, we can identify the numbers before and after a number. Look at these numbers. We see that 4 is before 5 and 5 is after 4. 1 2 3 4 5 6 7 8 9 10 11 12 20 19 18 17 16 15 14 13 32 2/16/2018 2:47:12 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 76

Fill in the blanks with before, between or after numbers. a) _____ is before 14. b) 15 is after _____. c) 7 is between 6 and _____. & Remembering and Understanding Comparing 2-digit numbers is similar to comparing 1-digit numbers. We can order the numbers after comparing them. Let us learn this concept. Before and after numbers Read the following: a) 11 comes before 12; 12 comes after 11. b) 9 comes before 10 and after 8. So, 9 lies between 8 and 10. c) 15 comes before 16 and after 14. So, 15 lies between 14 and 16. Example 9: Write the numbers that come before and after: a) 96 b) 31 c) 49 d) 55 e) 60 Solution: The numbers before and after the given numbers are: Number Before Number After Number 96 95 97 31 30 32 49 48 50 55 54 56 60 59 61 Compare numbers We use the concept of more and less to find the greater and the lesser numbers. The symbols for greater than, less than and equal to are is >, < and =. Numbers 33 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 77 2/16/2018 2:47:12 PM

Observe the following picture. The crocodile’s mouth is open The crocodile’s mouth is closed where there are more fish. where there are less fish. 4 is more than 1 or 4 is greater than 1. 2 is less than 3. We write it as 4 > 1. 2 is smaller than 3 We write it as 2 < 3. When both the numbers are the same, we say that both are equal to each other. We write as 4 = 4. Let us see a few examples of using the symbols <, > and =. Example 10: Fill in the blanks with the correct symbols (<, > or = ). a) 23 ______ 21 b) 99 ______ 98 c) 54 ______ 74 d) 13 ______ 13 e) 4 _______ 7 Solution: a) > b) > c) < d) = e) < Application Order 2-digit numbers We can compare more than two numbers. For that, we have to arrange them in order. There are two ways to do this: 34 2/16/2018 2:47:12 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 78

Ascending order: Writing the numbers from the smallest to the largest Descending order: Writing the numbers from the largest to the smallest Example 11: Write the numbers 26, 29 and 25 in ascending order. Solution: The given numbers are 26, 29 and 25. All the three numbers have 2 in their tens place, 2 6, 2 9, 2 5. So, let us compare the digits in their ones place, 2 6 , 2 9, 2 5. As 5 < 6 < 9, 25 < 26 < 29. So, the ascending order of the numbers is 25, 26, 29. Example 12: Write the numbers 34, 38 and 30 in descending order. Solution: The given numbers are 34, 38 and 30. All the numbers have 3 in their tens place, 3 4, 3 8, 3 0. So, let us compare the digits in their ones place, 3 4 , 3 8 , 3 0. As 8 > 4 > 0, 38 > 34 > 30. So, the descending order of the numbers is 38, 34, 30. Form 2-digit numbers Let us learn to form the greatest and the smallest 2-digit numbers. Example 13: Form the greatest and the smallest 2-digit numbers using 2 and 4 (without repeating the digits). Solution: To form the greatest number: TO 42 Write the bigger digit in the tens place and the smaller digit in the ones place. So, the greatest 2-digit number that can be formed is 42. To form the smallest number: Write the smaller digit in the tens place and the TO bigger digit in the ones place. 24 So, the smallest 2-digit number that can be formed is 24. Numbers 35 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 79 2/16/2018 2:47:12 PM

Example 14: F orm the greatest and the smallest 2-digit numbers using 5 and 7 (by repeating the digits). Solution: To form the greatest number: TO 77 Find the larger digit. Here, it is 7. Place the same digit in both the places in the place value chart. So, the greatest number is 77. To form the smallest number: TO Find the smaller digit. Here, it is 5. 55 Place the same digit in both the places in the place value chart. So, the smallest number is 55. Higher Order Thinking Skills (H.O.T.S.) Let us see another example. Example 15: Some children are in a row as shown. Observe the picture and answer the questions that follow. Suma Ravi Rahul Salman Rita Amy a) Which two boys are just after Suma? 2/16/2018 2:47:12 PM b) Between which two children is Salman? c) Who is at the right end? d) Who is just before Rahul? 36 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 80

Solution: a) Ravi and Rahul are just after Suma. b) Salman is between Rahul and Rita. c) Amy is at the right end. d) Ravi is just before Rahul. Drill Time Concept 3.1: Count in Ones and Tens 1) Write the numbers in the place value chart. a) 51 b) 90 c) 16 d) 72 e) 39 2) Write the number names of the given numbers. a) 49 b) 31 c) 94 d) 10 e) 32 3) Form numbers which have: a) 4 in the tens place and 1 in the ones place b) 9 in the tens place and 2 in the ones place c) 7 in the tens place and 3 in the ones place d) 8 in the tens place and 6 in the ones place e) 3 in the tens place and 8 in the ones place Concept 3.2: Compare 2-digit Numbers 4) Fill in the blanks with before, after or between numbers. a) _____ 45 b) 98 _____ c) 19 ______ 21 d) 87 _____ e) ______32 5) Write the symbols >, < or = in the following. a) 34 ____ 30 b) 20 ____ 12 c) 17 ____ 60 d) 84 ____ 84 e) 56 ____ 90 Numbers 37 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 81 2/16/2018 2:47:12 PM

6) Write the greater and the smaller numbers in each of these pairs. a) 39, 19 b) 87, 12 c) 65, 10 d) 45, 41 e) 76, 70 7) Arrange the numbers in ascending and descending orders. a) 87, 98, 80 b) 19, 17, 30 c) 40, 50, 19 d) 28, 19, 85 e) 34, 10, 99 8) Form the greatest and the smallest 2-digit numbers using the given digits. Do not repeat the digits. a) 3, 2 b) 9, 8 c) 1, 7 d) 4, 6 e) 7, 9 38 2/16/2018 2:47:12 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 82

Chapter Addition 4 Let Us Learn About • adding numbers up to 99 without regrouping. • adding two 1-digit numbers mentally. • different methods of adding numbers. Concept 4.1: Add 1-digit and 2-digit Numbers Think Bantei can count and add the number of his toys. His father asks him to add 35 and 22. He does not have that many objects to count and add. How can he add these numbers? NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 83 39 2/16/2018 2:47:12 PM

Recall Let us recall counting of objects. Look at the vegetables given. Count and write their numbers in the boxes. Vegetables Number a) b) c) 40 2/16/2018 2:47:13 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 84

d) e) & Remembering and Understanding A pencil stand has 3 pencils as shown in Fig. (a). Another pencil stand has 4 pencils as shown in Fig. (b). We count the pencils in the two stands continuously. The last number gives the total number of pencils. Counting the number of objects together is called addition. The answer in addition is called the sum. The words add, total, together, in all, altogether and sum are Fig. (a) Fig. (b) some words used in addition. We use the symbol ‘+’ (read as plus) for addition. Addition 41 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 85 2/16/2018 2:47:13 PM

Example 1: C ount and write the correct number of objects. One is done for you. a) 1 89 b) c) 2/16/2018 2:47:13 PM Methods of addition: 1) Addition using fingers 2) Addition using the number line 3) Vertical or column addition 42 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 86

Let us understand these methods. Addition using fingers Observe these fingers. Each of them shows the number given. Let us learn to add two numbers using fingers. Example 2: Add using fingers: a) 4 and 3 b) 1 and 5 c) 5 and 5 Solution: a) 4 + 3 += Open 4 fingers on one hand. Open 3 fingers on the other. Begin counting the fingers on one hand. Continue to count the fingers on the other hand. The number counted for the last finger is the sum or total. So, 4 + 3 = 7. Addition 43 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 87 2/16/2018 2:47:13 PM

b) 1 + 5 + = So, 1 + 5 = 6. c) 5 + 5 += So, 5 + 5 = 10. Addition using the number line A line marked with numbers is called the number line. We use it to add numbers. Let us see an example. Example 3: Add using the number line: a) 2 and 3 b) 4 and 4 c) 3 and 4 Solution: a) L et us find 2 + 3 using the number line. Draw an arrow from 0 to 2. T o add 3 to 2, we move 3 steps to the right of 2. Draw arrows for each step as shown. 44 2/16/2018 2:47:13 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 88

The number at which the steps end is 5. So, 2 + 3 = 5. b) 4 + 4 So, 4 + 4 = 8. c) 3 + 4 So, 3 + 4 = 7. Vertical or column addition We can add numbers by writing them one below the other. This is called vertical addition or column addition. Let us see a few examples. Addition of 1-digit numbers Example 4: Add 6 and 2 by writing the numbers in columns. Solution: Write the numbers under the ones place, as shown. O 6 +2 8 Addition of 2-digit numbers Example 5: Add the following by writing the numbers in columns. 23 + 32 Addition 45 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 89 2/16/2018 2:47:13 PM

Solution: Step 1: Add the ones Step 2: Add the tens + TO TO 23 23 +32 +32 5 5 5 Solve these TO TO T O 41 14 7 8 28 +3 3 +2 1 Application We now know how to add numbers. Let us see some real-life examples of addition of numbers. Example 6: Madhu has 5 kites and Sita has 4 kites. How many kites do they have in all? Solution: Write the numbers one below the other. Add them and write the sum as shown. O 5 +4 9 So, Madhu and Sita have 9 kites in all. Example 7: R am had 14 marbles. Shyam gave him 15 marbles. How many Solution: marbles does Ram have altogether? TO Write the numbers one below the other. Add them 14 and write the sum as shown. So, Ram has 29 marbles altogether. + 15 29 46 2/16/2018 2:47:13 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 90

Higher Order Thinking Skills (H.O.T.S.) We have learnt how to add two 1-digit and 2-digit numbers. Let us now learn to add three 1-digit and 2-digit numbers. Example 8: Sunita bought 2 mangoes, 3 apples and 4 bananas. How many fruits did she buy altogether? Solution: Write the numbers under the ones place and add. O 2 +3 +4 9 So, Sunita bought 9 fruits. Example 9: There are 14 students in Row 1. Row 2 has 15 students. Row 3 has 10 students. How many students are there altogether? Solution: Write the numbers one below the other. Step 1: Add the ones Step 2: Add the tens T O TO 14 14 + 15 + 15 + 10 + 10 9 39 So, there are 39 students altogether. Addition 47 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 91 2/16/2018 2:47:13 PM

Concept 4.2: Add Two 1-digit Numbers Mentally Think Bantei had 4 chocolates. His sister gave him 2 more. Bantei could tell the total number of chocolates he has. But he did not use a paper and a pencil. Can you try to find the total mentally? Recall To add numbers mentally, first we must know the correct order of numbers. Let us practise the correct order of numbers. Write the numbers in the blanks given. a) 1 to 20 1 ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ 20 ___ ___ ___ ___ ___ ___ ___ b) 33 to 42 33 ___ ___ ___ ___ ___ ___ ___ ___ 42 48 2/16/2018 2:47:13 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 92

c) 26 to 45 26 ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ 45 ___ ___ ___ ___ ___ ___ ___ d) 21 to 25 21 ___ ___ ___ 25 & Remembering and Understanding To add two numbers mentally, first keep the bigger number in mind. Then, count the smaller one on the fingers. If the two given numbers are the same, we can keep any number in mind and count the other number on the fingers. Let us understand, through these examples. Example 10: Add 2 and 5 mentally Solution: Follow these steps to add mentally: Steps Solved Solve this 2+5 3+6 Step 1: Keep the bigger number in mind. The bigger number is 5. The bigger number is So, keep 5 in mind. ____. So, keep ____ in mind. Addition 49 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 93 2/16/2018 2:47:13 PM

Steps Solved Solve this 2+5 3+6 Step 2: Keep as many fingers open as the The smaller number is The smaller number is smaller number. 2. So, keep 2 fingers open. ____. So, keep ____ fingers Step 3: Begin counting open. the fingers. Start from the The number after 5 is The number after ____ is number after the bigger 6. Count 2 fingers as 6 number. and 7. ____. Count ____ fingers as ____, _____ and _____. Step 4: Write the last The sum of 2 and 5 is 7. The sum of 3 and 6 is ___. number as the sum of the given numbers. Example 11: Add 6 and 7 mentally Solution: Follow the steps to add mentally: Steps Solved Solve this Step 1: Keep the bigger 6+7 5+9 number in your mind. The bigger number is 7. The bigger number is So, keep 7 in mind. ____. So, keep ____ in mind. Step 2: Keep as many The smaller number is The smaller number is fingers open as the 6. So, keep 6 fingers ____. So, keep ___ fingers smaller number. open. open. Step 3: Begin counting The number after 7 is 8. The number after _____ is the fingers. Start from the Count 6 fingers as 8, 9, number after the bigger ____. Count ____ fingers number. 10, 11, 12 and 13. as ____, ____, ____, ____ and ____. Step 4: Write the last The sum of 6 and 7 The sum of 5 and 9 is _________. number as the sum of the is 13. given numbers. 50 2/16/2018 2:47:13 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 94

Application We have seen how easy it is to add two 1-digit numbers mentally. Let us now see a few real life-examples. Example 12: In a class, Team A has 5 students and Team B has 7 students. How many students are there in all? Solution: Number of students in Team A = 5 Number of students in Team B = 7 The bigger number is 7. Keep 7 in the mind. The smaller number is 5. Keep 5 fingers open. After 7, count 5 fingers as 8, 9, 10, 11 and 12. So, the total number of students in the class is 12. Example 13: Seema has 3 milk chocolates and 6 dark chocolates. How many chocolates does she have in all? Solution: Number of milk chocolates = 3 Number of dark chocolates = 6 The bigger number is 6. Keep 6 in the mind. The smaller number is 3. Keep 3 fingers open. After 6, count 3 fingers as 7, 8 and 9. So, Seema has 9 chocolates in all. Higher Order Thinking Skills (H.O.T.S.) We have seen mental addition of two 1-digit numbers. Let us now add three 1-digit numbers mentally. Example 14: Add mentally: 3, 5 and 7 Solution: Follow the steps to add mentally: Steps Solved Solve this 3, 5 and 7 4, 6 and 8 Step 1: Choose the first two numbers. The first two numbers The first two numbers are are 3 and 5. ____ and ____. Addition 51 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 95 2/16/2018 2:47:13 PM

Steps Solved Solve this 3, 5 and 7 4, 6 and 8 Step 2: Keep the bigger number in mind. The bigger number is 5. The bigger number is So, keep 5 in mind. ____. So, keep ____ in mind. Step 3: Keep as many The smaller number is The smaller number fingers open as the 3. So, keep 3 fingers is _____. So, keep _____ smaller number of the 2 open. fingers open. numbers. Step 4: Begin counting The number after _____ is the fingers. Count from the number after the The number after 5 is 6. _____. Count the ______ bigger number. Count the 3 fingers as fingers as _____, _____, 6, 7 and 8. _____ and ______. Step 5: Compare the sum The sum of the first two of the first two numbers The sum of the first two with the third number. numbers is 8. So, keep numbers is _____. So, Keep the bigger number 8 in mind. keep _____ in mind. in mind. Step 6: Keep as many The third number is The third number is ____. fingers open as the third 7. So, keep 7 fingers So, keep ______ fingers number. open. open. 52 2/16/2018 2:47:13 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 96

Steps Solved Solve this 3, 5 and 7 4, 6 and 8 Step 7: Begin counting the fingers. Count from The number after ______ the number after the sum of the first two is _____. Count the numbers. The number after 8 is 9. Count the 7 fingers as ______ fingers as _____, Step 8: Write the last 9, 10, 11, 12, 13, 14 and _____, _____, _____, number as the sum. 15. _____, _____, _____, and _____. The sum of 3, 5 and 7 The sum of 4, 6 and 8 is is 15. _____. Example 15: R ahul has 3 apples, 4 chikoos and 6 bananas in his basket. How many fruits does he have in all? Solution: Number of apples in the basket = 3 Number of chikoos in the basket = 4 Number of bananas in the basket = 6 So, the first two are 3 apples and 4 chikoos. The bigger number is 4. Keep 4 in the mind. The smaller number is 3. Open 3 fingers. After 4, count 3 fingers as 5, 6 and 7. So, the sum of the first two numbers is 7. The number of bananas is 6. The bigger number is 7. Keep 7 in the mind. The smaller number is 6. Open 6 fingers. After 7, count 6 fingers as 8, 9, 10, 11, 12 and 13. So, Rahul has 13 fruits in all. Addition 53 NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 97 2/16/2018 2:47:13 PM

Drill Time Concept 4.1: Add 1-digit and 2-digit Numbers 1) Add the following numbers using the Number line. a) 3 and 3 b) 2 and 6 c) 1 and 7 d) 4 and 2 e) 3 and 4 2) Add the following numbers using the vertical or column method. a) 2 and 5 b) 3 and 6 c) 21 and 42 d) 17 and 61 e) 10 and 40 3) Word problems a) I have 2 pens and my sister has 2 pens. What is the total number of pens with us? b) Krish picked 12 sticks and Sanjay picked 20 sticks. How many sticks did they pick in all? Concept 4.2: Add Two 1-digit Numbers Mentally 4) Add mentally a) 2 and 7 b) 1 and 3 c) 3 and 3 d) 8 and 2 e) 7 and 9 54 2/16/2018 2:47:13 PM NR_181910046_BGM_Maple G1_Textbook Integrated_Term1_text.pdf 98

TERM 1 EVS I Divider Term1.pdf 1 2/22/2018 11:37:45 AM

Preface IMAX partners with schools, supporting them with learning materials and processes that are all crafted to work together as an interconnected system to drive learning. IMAX presents the latest version of the Maple series – updated and revised after considering the perceptive feedback and comments shared by our experienced reviewers and users. Designed specifically for state board schools, the Maple series endeavours to be faithful to the spirit of the State Curriculum Framework and the National Curriculum Framework (NCF) 2005. Therefore, our books strive to ensure inclusiveness in terms of gender and diversity in representation, catering to the heterogeneous Indian classroom. The larger aim of the NCF 2005 regarding EVS teaching is to acknowledge and address the dynamic nature of EVS by focusing on the development of skills to acquire and process information scientifically. The Maple EVS textbooks and workbooks for state board schools offer the following features:  Interactive content that engages students through a range of open- ended questions that build curiosity and initiate scientific exploration  Opportunities for experimentation, analysis and synthesis of ideas and concepts  Exposure to locally relevant environmental problem solving  Effective use of visual elements to enable learning of structures, processes and phenomena  A focus on EVS specific vocabulary building  Integrated education of values and life skills  Promotion of participatory and contextualised learning through the engagement of all relevant stakeholders in the learning process Overall, the IMAX Maple EVS textbooks, workbooks and teacher companion books aim to enhance the development of scientific temper along with the inculcation of healthy habits, skills and values that promote environmentally sensitive and culturally responsive democratic citizenship among students. – The Authors Preface 2.pdf 1 2/22/2018 11:40:18 AM