Mathematics_Year_2_Part_1

LET’S ANSWER Solve the problems. 1 Davin uses a calculator. He presses the numbers 6, 0 and 9. State the number in words. 2 Siti arranged all the cards shown. She formed the largest number. What is the number? 3 Look at the table of Mathematics quiz marks. Mathematics Quiz Name Marks a Arrange the marks in ascending order. Zaki Zana 780 Reeya Daren 810 b Who is the winner? 800 790 c What is the number pattern? 4 The following are the guesses of 5 participants. The Chocolate Guessing Contest Chocolate Guessing Contest Yi Han Faris Radin Punita Silva 552 524 538 525 510 Who is the winner if the total number of chocolates is 530? T EACHENRO’TSES • Encourage pupils to do exercises involving number skills by surfing 1.8.1 https://www.ixl.com/search?q=number+up+to+1000 43 • Emphasise that zero cannot be placed in front of a number because it has no value. For example, 019.

ET’S HAVE FUN L Number Song T Letʼs sing a song. Letʼs learn my dear friends The story of numbers There are hundreds, tens, and ones Hundreds number has three digits Arrange numbers in two ways Ascending order makes numbers larger Descending order makes numbers smaller Easy learning, we are all happy! Now it is the time to round off If it is the tens which is asked Look at the value of the ones If it is less than 5 So zero it will be Now we are rounding off to hundreds It is the hundreds which is asked Look at the value of the tens If it is 5 or more00:9 Add 1 to the hundreds value Scan9:00 me 44 EACHENRO’TSES 1.1.2 (iv) • Sing the song to the melody of Rasa Sayang. Prepare number cards 1.2.1 and place value cards to be used by pupils while singing. 1.4.1 1.6.1 • Discuss other skills, such as place value, digit value, and counting AB 29-30 numbers indirectly.

ADDITION, SUBTRACTION, MULTIPLICATION, AND DIVISION There I add are 60 another pieces. 50 pieces. Mother, let’s buy Each row has 8 pieces of curry puffs. 3 people. Let’s eat together. Each of us eats 2 pieces of curry puffs. EACHENRO’TSES • Ask pupils to tell stories based on the pictures. Relate them to 2.1 2.2 addition, subtraction, multiplication, and division operations. 2.3 T For example, add 50 pieces and 60 pieces of curry puffs. 2.4 45 • Surf http://www.k5learning.com/free-math-worksheets/ second-grade-2/addition/adding-3-digit-and-1-digit-numbers

ADD TWO NUMBERS DOUGHNUTS ORDER apple chocolate strawberry durian 120 100 6 50 pieces pieces pieces pieces 1 Total the number of apple and chocolate doughnuts. 120 + 6 = Count on 6 steps. +1 +1 +1 +1 +1 +1 120 121 122 123 124 125 126 120 + 6 = 126 The total number of apple and chocolate doughnuts is 126 pieces. 2 How many and 3 Add 120 and 100. doughnuts are there altogether? 120 + 100 = 120 + 50 = + 100 + 10 + 10 + 10 + 10 + 10 120 120 130 140 150 160 170 What is the 120 + 50 = 170 answer? 46 EACHENRO’TSES • Guide pupils to add without regrouping. Instead, use base blocks, 2.1.1 hundreds square, and others. T • Surf http://www.k5learning.com/free-math-worksheets/second- grade-2/addition/adding-whole-tens-to-2-digit-number AB 31

4 S toryb ook Dona t ion Class 2 Amanah 2 Bakti 2 Jaya 107 Quantity 131 62 a Total the storybooks donated by 2 Amanah and 2 Bakti. 131 + 62 = Method 1 Method 2 hundreds tens ones 1 31 +0 62 hundreds tens ones 1 93 Method 3 + 60 + 2 62 60 131 141 151 161 171 181 191 2 193 131 + 62 = 193 The total donation is 193. b hundreds tens ones Ani calculates the donation by 62 2 Bakti and +1 07 2 Jaya. Is it correct? Discuss. 7 27 47EACHENRO’TSES • Emphasise the importance of placing digits at the correct place value. 2.1.1 T • Guide pupils to add, starting from ones, followed by tens, then hundreds. • Surf http://www.k5learning.com/free-math-worksheets/second- grade-2/addition/add-3-digit-numbers-in-columns-no-regrouping

5 Add 134 and 225. Use the vertical form. 134 + 225 = 1 3 4 + 2 2 5 3 5 9 134 + 225 = 359 6 216 + = 348 What is the number in the ? 2 1 6 21 13 62 + 1 3 2 3 4 8 3 4 8 216 + 132 = 348 The number in the is 132. + = 269 103 Choose one number 126 52 in . Choose another 217 237 number in . The total number is 269. 32 166 143 48 EACHENRO’TSES • Provide more activities that involve mental calculation. 2.1.1 • Do a quick calculation quiz. T • Surf http://www.k5learning.com/free-math-worksheets/first-grade-1/ addition/add-two-2-digit-numbers-in-columns-no-regrouping AB 32-34

7 a 103 + 16 = h t o h t o h t o Up 103. 1 0 3 + 1 6 1 1 9 Add 16, The up 1 tens and answer is up 6 ones. 119. 103 + 16 = 119 Add 112. b 234 + 112 = Up 1 hundreds, up 1 tens. 2 3 4 Lower beads + 1 1 2 are not 3 4 6 enough to up 2 ones. 00:9 Little friend Up 234. of 2 is 3. Scan 5 So, me up 5 9:00 2 3 down 3. The answer is 346. 234 + 112 = 346 T EACHENRO’TSES • Train pupils to add using abacus by finding “little friend”, which 2.1.1 is the combination of 5. 49 • Refer to the abacus module to guide pupils to use the abacus correctly.

c 621 + 334 = 621 Add 334. Up + 334 3 hundreds. Lower beads 955 are not enough to up Up 621. 3 tens and 4 ones. The answer is 955. 5 Tens: Up 5, 621 + 334 = 955 3 2 down 2. LET’S ANSWER 5 Ones: Up 5, 1 Add. 4 1 down 1. a 580 b 720 + 9 + 3 6 c 647 + 301 d 300 + 400 = e 210 + 150 = 2 Complete these. a 3 0 4 b 6 5 c + + +931 3 2 6 4 7 9 9 8 5 50 EACHENRO’TSES • Explain to pupils that addition can be solved using subtraction to find 2.1.1 the unknowns. T AB 34

MORE ADDITION 1 139 add 8. Calculate the total hundreds tens ones number of ice cream. 139 + 8 = 1 3 9 + 8 17 1 1 +0 39 1 08 47 9 ones + 8 ones = 17 ones 1 tens + 3 tens 1 17 ones = 1 tens + 7 ones + 0 tens = 4 tens 1 3 9 + 8 1 hundreds + 0 hundreds = 1 hundreds 1 4 7 139 + 8 = 1 47 The total number of ice cream is 147. T EACHENRO’TSES • Guide pupils to regroup numbers starting from ones to tens. 2.1.1 Emphasise that when the total digit of ones becomes 10 or more, 51 carry out regrouping.

2 Total 409 and 6. 409 + 6 = Method 1 + 1 + 1 + 1 + 1 + 1 + 1 409 410 411 412 413 414 415 Method 2 409 + 6 = 409 + 6 = 1 5 405 4 409 + 1 = 410 6 + 4 = 10 410 + 5 = 415 405 + 10 = 415 Method 3 1 Try to solve this. 8+5= 4 0 9 Choose any of + 6 the methods. 4 1 5 T 30 409 + 6 = 415 52 EACHENRO’TSES • Guide pupils to add using a variety of aids such as base blocks, 2.1.1 counting frames, and abacus. • Surf http://www.mathinenglish.com/worksheetview.php?id=54&stid AB 37 =40025

3 Add 82 and 145. hundreds tens ones 82 + 145 = +1 82 45 12 7 2 ones + 5 ones = 7 ones 8 tens + 4 tens = 12 tens = 1 hundreds + 2 tens + 1 82 45 0 1 27 2 1 hundreds + 0 hundreds + 1 hundreds = 2 hundreds 1 82 + 145 = 227 8 2 + 1 4 5 2 2 7 Is this the 9 6 correct + 4 2 3 answer? Explain. 4 1 1 9 T EACHENRO’TSES • Guide pupils to add using regrouping from tens to hundreds. 2.1.1 • Surf http://www.mathinenglish.com/worksheetview.php?id=49&stid= 40025 53

4 267 + 358 = hundreds tens ones 2 67 +3 58 15 2 1 +3 67 58 12 5 1 1 2 67 +3 58 25 6 1 1 267 + 3 5 8 625 267 + 358 = 625 54 EACHENRO’TSES • Provide question cards or worksheets on adding two numbers 2.1.1 involving regrouping. T • Surf http://www.mathinenglish.com/worksheetview.php?id =55&stid =40025

5 384 + 199 = Use the vertical form. Method 1 1 1 384 + 1 9 9 583 Method 2 384 = 300 + 80 + 4 1 99 = 100 + 90 + 9 400 + 1 70 + 13 400 + 100 + 70 + 10 + 3 = 583 Method 3 199 add 1 equals 200. 384 minus 1 384 + 199 = – 1 + 1 equals 383. 383 + 200 = 583 384 + 199 = 583 55EACHENRO’TSES • Guide pupils to add using various methods such as partial method and 2.1.1 T partition, or other suitable ones. • Surf https://www.ixl.com/math/grade-2/addition-with-three-digit-numbers AB 35-37

6 a 754 + 28 = 1 Up 754. Add 28. Up 2 tens. 754 Lower beads + 2 8 are not enough to up 8 ones. 00:9 782 Scan Big friend me of 8 is 2. 9:00 10 So, down The answer 2 ones is 782. 754 + 28 = 782 8 2 and carry 1 tens. b 871 + 92 = 1 Up 871. Add 92. Lower beads 871 are not enough to up 9 tens. + 9 2 Big friend 00:9 of 9 is 1. 963 10 So, down 1 tens Scan me 9 1 and carry 1 hundreds. 9:00 Up 2 ones. The answer is 963. 871 + 92 = 963 56 EACHENRO’TSES • Train pupils to add using abacus by finding ‟big friend”, which is a 2.1.1 combination of 10. Ask them to list the combination of 10. T AB 38

The total of which two numbers is nearest to 1 000? 485 437 509 490 LET’S ANSWER 1 Add. 2 Complete these. a 304 + 6 a 5 3 b 2 + 2 + 4 7 b 620 + 99 9 0 1 1 0 0 0 c 151 + 199 = c 5 1 7 d = 67 + 618 + 84 00:9 d 368 Scan + 275 me 9:00 3 Find the total of two numbers on the same colour cards. 75 108 472 53 265 249 T EACHENRO’TSES • Provide more group work using question cards or worksheets 2.1.1 to vary the questions based on the levels of difficulty. 57 • Surf https://www.ixl.com/math/grade-2/complete-the-addition- sentence-up-to-three-digits

ADD THREE NUMBERS 1 56 103 220 60 100 Adi Su Lin What is Adi’s total score? Add two numbers 56 + 103 + 220 = first. Then, add the Method 1 1 5 9 answer with the 5 6 +220 other number. + 1 0 3 3 7 9 1 5 9 Method 2 5 6 Add all numbers 103 together. +220 379 56 + 103 + 220 = 379 Adi’s total score is 379. Su Lin’s total score is the same as Adi’s. What is the score for the blue skittle? 58 EACHENRO’TSES • Guide pupils to add using various methods. Discuss the common 2.1.2 mistakes such as not placing the number at the correct place value. T • Surf http://www.mathinenglish.com/worksheetview.php?id =52&stid=40020

2 Carp Tilapia 213 37 How many fish are there Catfish altogether? 145 213 + 145 + 37 = 1 Make 10 first. 213 10 1 45 + 37 395 213 + 145 + 37 = 395 T here are 395 fish altogether. 3 Total up 473, 98 and 318. 473 + 98 + 318 = 11 16 Add the same two digits first. 473 98 +3 1 8 889 473 + 98 + 318 = 889 EACHENRO’TSES • Guide pupils to add complement of 10 or add the same two numbers 2.1.2 first. T 59 • Surf http://www.mathinenglish.com/worksheetview.php?id=51&stid= 40020

4 Floria Florist Rose Sunflower Orchid 312 237 88 = 312 + 237 + 88 Method 1 4 0 0 First, add 312 +237 and 88. Then, 1 1 3 1 2 6 3 7 add 237. + 8 8 4 0 0 Method 2 637 = 312 + 237 + 88 Find the numbers 101 Example: between 101 to 107. 104 1 The total number 1 0 1 of each straight line 105 107 1 0 4 is 312. +107 3 1 2 60 EACHENRO’TSES • Guide pupils to find the unknown value using mental calculation. 2.1.2 T AB 39-41

LET’S EXPLORE Materials/Resources number cards 1 to 9 1 23456789 Method R BG 1 Arrange the 1 47 number cards 258 according to the + 3 6 9 assigned colours. 7 7 4 2 Change the arrangement of numbers within the R , B and G groups. What do you find? 3 Write five number sentences for the same total. LET’S ANSWER Find the total. a 4 0 b 2 3 0 c 6 2 4 1 1 6 5 4 1 0 8 +231 + 1 05 +1 95 d 73 + 420 + 105 = e = 214 + 485 + 300 f 148 + 217 + 364 = g = 453 + 299 + 147 EACHENRO’TSES • Guide pupils to explore number addition through activities such as 2.1.2 Let’s Explore to strengthen their understanding. 61 T

SUBTRACTION There were 150 balloons. 1 40 balloons were given away to the children. How many balloons are left? Count back 150 – 40 = in tens. 110 120 130 140 150 – 10 – 10 – 10 – 10 150 – 40 = 110 There are 110 balloons left. 2 Ice creams What is the difference between the Corn Vanilla corn ice cream and the vanilla ice cream? 300 – 200 = 300 200 100 100 100 100 100 300 – 200 = 100 The difference is 100. 62 EACHENRO’TSES • Guide pupils to subtract without regrouping using number lines and 2.2.1 hundred squares. T • Surf http://www.k5learning.com/free-math-worksheets/second- grade-2/subtraction/subtract-whole-tens-from-hundreds

3 I sold 32 from 285 tickets. 285 – 32 = Method 1 How many tickets have not been sold? hundreds tens ones hundreds tens ones Method 2 hundreds tens ones Method 3 Subtract ones. 5 ones − 2 ones hundreds tens ones = 3 ones 285 Subtract tens. – 3 2 2 8 5 8 tens − 3 tens – 0 3 2 = 5 tens 253 2 5 3 Subtract hundreds. 2 hundreds − 0 hundreds = 2 hundreds 285 – 32 = 253 The number of unsold tickets is 253 pieces. T EACHENRO’TSES • Guide pupils to subtract using various methods such as using counters 2.2.1 and drawing diagrams. 63 • Surf http://www.k5learning.com/free-math-worksheets/second- grade-2/subtraction/subtract-whole-tens-from-3-digit-numbers

4 What is the 349 – 216 = 349 difference 216 between these 349 two numbers? – 2 1 6 133 349 – 216 = 133 5 Subtract 317 from 438. What is the answer? 438 – 317 = 438 – 3 1 7 438 – 317 = 6 789 – = 453 Find the value in . Method 1 7 89 Method 2 34 35 63 789 789 – 3 3 6 – 4 5 3 453 336 789 – 336 = 453 64 EACHENRO’TSES • Guide pupils to complete the number sentence involving the unknowns 2.2.1 using smaller number simulation. T • Encourage pupils to check the answers using addition. • Surf http://www.k5learning.com/free-math-worksheets/second-grade-2/ subtraction/subtract-3-digit-numbers-no-regrouping

7 263 – 41 = 263 – 4 1 222 Up 263. Subtract 41. Down 4 tens. Lower The answer is 222. beads are not enough. 263 – 41 = 222 Little friend of 4 is 1. LET’S ANSWER 5 So, up 1 1 Subtract. b 5 9 0 – 7 0 4 1 and down 5. a 3 4 2 Down 1 ones. – 1 1 c 6 5 8 d 9 8 7 – 4 0 0 – 3 2 5 2 What are the 789 – 568 = numbers in the – = blue circles? 254 = 475 – EACHENRO’TSES • Guide pupils to subtract using the abacus involving “little friend”. 2.2.1 AB 42-43 • Surf the Internet to obtain an abacus module that shows examples of T 65 subtraction in detail.

MORE SUBTRACTION 1 Calculate the balance of 173 minus 39. 173 – 39 = hundreds tens ones 6 13 1 7 3 – 3 9 3 ones cannot subtract 9 ones. Change 1 tens to 10 ones. 3 ones + 10 ones = 13 ones 6 13 1 7 3 – 0 3 9 1 3 4 Subtract ones. Subtract tens. Subtract hundreds. 13 ones − 9 ones 6 tens − 3 tens 1 hundreds = 4 ones = 3 tens − 0 hundreds = 1 hundreds 6 13 1 73 – 3 9 134 173 – 39 = 134 66 EACHENRO’TSES • Guide pupils to subtract by regrouping tens to ones. Emphasise that if 2.2.1 T the digit in ones is not enough, regroup tens to ones. • Surf http://www.k5learning.com/free-math-worksheets/second- grade-2/subtraction/subtract-3-digit-numbers-with-regrouping

2 Subtract 185 from 346. hundreds tens ones 346 – 185 = 3 4 6 Subtract ones. – 1 8 5 6 ones − 5 ones = 1 ones 1 2 14 3 4 6 – 1 8 5 Change 1 hundreds to 10 tens. 1 4 tens + 10 tens = 14 tens 2 14 3 4 6 – 1 8 5 1 6 1 Subtract tens. 2 14 Subtract hundreds. 346 346 – 185 = 161 – 1 8 5 161 T EACHENRO’TSES • Guide pupils to subtract by regrouping tens to ones and hundreds to 2.2.1 tens using counters or other suitable objects. 67 • Surf http://www.mathworksheets4kids.com/Subtraction/3digit-1.pdf

3 200 – 153 = hundreds tens ones 1 10 2 0 0 – 1 5 3 9 1 10 10 2 0 0 – 1 5 3 9 1 10 10 2 0 0 – 1 5 3 0 4 7 Why is 0 in hundreds 9 not written? 1 10 10 200 – 1 5 3 47 200 – 153 = 47 68 EACHENRO’TSES • Guide pupils to subtract by regrouping hundreds to tens and tens to 2.2.1 ones. T • Encourage pupils to check their answers with addition. • Surf https://www.youtube.com/watch?v=Y6M89-6106I

4 934 – 218 = Method 1 2 14 934 – 2 1 8 7 1 6 Method 2 I partition the numbers. 934 900 20 14 218 – 200 Then, 30 4 subtract. Finally, I total 10 8 the answers. 700 10 6 716 Method 3 934 – 218 = +2 +2 Add 2 to 218 to make it 220. 936 – 220 = 716 Also, add 2 to 934. 936 – 2 2 0 716 934 – 218 = 716 EACHENRO’TSES • Train pupils to subtract using various methods to strengthen their 2.2.1 understanding. Provide a variety of questions such as the example T shown above. 69 • Surf https://www.ixl.com/math/grade-2/subtract-three-digit-numbers

5 932 – = 578 Find the number in the . Method 1 12 Method 2 12 8 2 12 8 2 12 932 932 – 3 5 4 – 5 7 8 578 354 932 – 3544 = 578 6 – 406 = 531 Method 1 Method 2 937 937 53 1 – 4 0 6 4 50 3 6 1 +406 531 937 937 – 406 = 531 7 30 1 8 Fill in the white boxes 1 –= with the digits shown above to get the answer with the smallest value. 70 EACHENRO’TSES • Guide pupils to complete the number sentence involving unknowns 2.2.1 using hundred squares and base blocks. T • Surf http://www.k5learning.com/free-math-worksheets/second- grade-2/subtraction/subtract-3-digit-missing-numbers-no-regrouping

7 910 – 584 = 10 00:9 8 0 10 Up 910. Subtract 584. 910 Scan Down 5 hundreds. – 5 8 4 me9:00 Down 8 tens, lower 326 beads are not enough. Big friend of 4 is 6. Big friend of 8 is 2. 10 So, remove 1 tens. 10 So, remove 1 hundreds. Up 6 ones. Up 2 tens. 8 2 Down 4 ones, there 4 6 is no lower bead. 867 – 172 = Try to calculate using the abacus. The answer is 326. 910 – 584 = 326 EACHENRO’TSES • Train pupils to subtract using the abacus involving “big friend”. 2.2.1 T 71 AB 44-48

Find the values of and . 6 0 – 2 7 383 LET’S ANSWER 1 Subtract. b 6 5 7 c 8 0 3 – 4 8 0 – 2 9 a 3 4 2 – 1 6 d 705 – 38 = e 613 – 97 = f = 900 – 315 g 509 – = 72 2 Correct the answers. a 3 0 0 b 6 5 1 c 7 0 4 – 1 8 – 2 7 9 – 8 3 292 428 68 1 3 a Subtract 98 from 800. b What is the difference between 115 and 204? 72 EACHENRO’TSES • Provide more questions in question cards or worksheets. 2.2.1 T

SUBTRACT SUCCESSIVELY 1 There are 289 60 durians altogether. 105 How many durians are left? Then, 289 – 60 – 105 = subtract 105. Method 1 29 05 First, subtract 60 24 from 289. 2 89 2 – 60 – 1 2 29 1 Method 2 2 8 9 Try to subtract this. – 1 0 5 Is the answer the same? – 60 289 – 60 – 105 = 124 There are 124 durians left. T EACHENRO’TSES • Guide pupils to carry out repeated subtraction simulation activities 2.2.2 using base blocks. 73 • Surf http://www.math-salamanders.com/image-files/math- worksheets-printable-column-subtraction-3-digits-3.gif

2 325 – 81 – 33 = 2 12 3 2 5 – 8 1 4 2 12 3 2 5 – 8 1 2 4 4 325 – 81 – 33 = 211 2 4 4 – 3 3 2 1 1 3 600 – 95 – 400 = Subtract 400 from Then, subtract 95. 600 first. 9 6 0 0 1 10 10 – 4 0 0 2 0 0 2 0 0 – 9 5 1 0 5 600 – 95 – 400 = 105 74 EACHENRO’TSES • Guide pupils to subtract by regrouping using counters, abacus, and 2.2.2 others. T • Surf http://www.math-salamanders.com/image-files/math- worksheets-for-2nd-grade-column-subtraction-3-digits-2.gifa

4 498 – 32 – 21 = Up 498. Subtract 32. Down 3 tens. 498 Down 2 ones. – 3 2 Subtract 21. 466 Down 2 tens, lower 00:9 beads are not enough. – 2 1 Little friend of 2 is 3. 445 5 So, up 3 and Scan 2 3 down 5. me9:00 Down 1 ones. The answer is 445. 498 – 32 – 21 = 445 LET’S ANSWER Calculate. 30 b 9 8 7 – 5 3 9 – 1 0 6 a 3 6 5 – 2 4 – c 820 – 123 – 167 = d 537 – 86 – 371 = EACHENRO’TSES • Guide pupils to subtract repeatedly using various methods. Encourage 2.2.2 AB 49-51 them to use an abacus when subtracting. T 75 • Emphasise that the answer transferred for repeated subtraction must be correct.

CREATE STORIES 1 Proton Perodua Iriz Bezza Indah Company sells 203 Proton Iriz cars and 84 Perodua Bezza cars. 203 + 84 = 287 The total sales is 287. 2 Grade A Grade C There are 300 grade A eggs and 210 grade C eggs. 300 210 The difference between the 300 – 210 = 90 number of grade A eggs and 3 grade C eggs is . 342 + 269 = 611 Hadi’s brother sells 342 4 295 – 188 = 107 grilled chickens. He also sells 269 fried chickens. The total sales of the chicken is . There are books on the shelf. are storybooks. The remaining 107 are novels. 76 EACHENRO’TSES • Guide pupils to create stories using their own words. Carry out 2.5.1 activities in pairs. Accept any suitable stories. T • Surf https://www.ixl.com/math/grade-2/subtraction-word-problems- up-to-three-digits

5 518 – 246 – 137 = 135 There are 518 recycle bags. bags are sent to supermarket A. bags are sent to supermarket B. The number of bags left is . Look at the pictures. Create a story of addition and a story of subtraction. 185 126 107 94 LET’S ANSWER 1 Complete the story. sport Juara Company sold shirts and school shirts. The total number of shirts sold is . 341 + 189 = 530 2 Create stories for the number sentences. a 416 – 123 = 293 b 104 + 120 + 135 = 359 EACHENRO’TSES • Guide pupils to create stories using their own words. Carry out 2.5.1 activities in pairs. Accept any suitable stories. 77 T AB 52-53

SOLVE IT Biscuits Number ChBoisccoulaitte 1 This table shows the of tins Cheese amount of biscuits Chocolate 126 donated by Neeta. Calculate the total 279 amount of biscuits. Method 126 tins of cheese 279 tins of Cheese Biscuit chocolate biscuits biscuits Number sentence Total 126 + 279 = 11 Draw a diagram. 126 +279 405 126 + 279 = 405 The total amount of biscuits is 405 tins. 2 Husin plucks 374 corn cobs. He sells 96 of them. What is the balance? 374 Method 96 Balance Number sentence 374 – 96 = 16 2 6 14 374 – 96 278 374 – 96 = 278 The balance of the corn cobs is 278. 78 EACHENRO’TSES • Ask pupils to understand questions by jotting down the important 2.5.2 points given. T • Train pupils to underline important points and write number sentences based on the problems given.

3 Kim’s father rears goats and cows. He has 298 goats. The number of cows is 54 more than the goats. Calculate the number of cows. Method 298 Goats 54 Cows ? 298 + 54 = 11 2 98 + 54 352 298 + 54 = 352 The number of cows is 352. Juli’s father rears 136 goats less Look at the than Kim’s father. Calculate the diagram. Solve it. number of goats Juli’s father has. Kim’s father’s goats 298 Juli’s father’s goats 136 ? T EACHENRO’TSES • Guide pupils to solve problems using simulation and check the 2.5.2 AB 54-55 answers using subtraction. 79 • Emphasise the steps taken to solve problems by identifying the given information that is needed, choosing strategies, determining the operation, solving, and checking the answers.

LET’S ANSWER Solve the problems. 1 Amni has 122 rubber bands. Divani has 176 rubber bands. Calculate the total number of rubber bands they have. 122 176 2 Farid has 199 keychains. He gave 18 keychains to Rizal. Calculate the balance of Farid’s keychains. 3 The table shows the number of participants in a gotong-royong. Participants Number Adults 306 Children 129 a Calculate the total number of participants. b What is the difference between the number of adults and children? 4 My height is I am 3 centimetres 128 centimetres. taller than Lisa. Lisa Dina Calculate Dina’s height. 80 EACHENRO’TSES • Provide more practices to strengthen pupils’ understanding according 2.5.2 to their abilities. T • Surf https://www.superteacherworksheets.com/addition-2-digit.html

MULTIPLICATION 1 There are 3 children. Each child has 2 balloons. 3 groups of two 2+2+2=6 3 times 2 makes 6. 3 times 2 is 3 times 2 is equal to 6. 3 multiplied by 2. Number 3×2=6 Total of groups number Number of of objects objects in each group This is the number sentence. 3×2=6 EACHENRO’TSES • Carry out simulation of grouping objects in the same amount to construct a 2.3.1 number sentence. Introduce the terms and symbols related to multiplication. T Emphasise that multiplication is repeated addition. 81 • Surf https://www.ixl.com/math/grade-2/relate-addition-and-multiplication- for-equal-groups

2 I arranged these I arranged the mooncakes in 2 rows. Each row mooncakes in has 4 mooncakes. 4 rows. Each row has 2 mooncakes. +4 +4 +2 +2 +2 +2 04 8 02468 2 times 4 makes 8. 4 times 2 makes 8. 2 multiplied by 4 4 multiplied by 2 is equal to 8. is equal to 8. 2×4= 8 4×2= 8 2 × 4 is the same as 4 × 2 2×4=4×2 Form a number sentence. × =8 82 EACHENRO’TSES • Guide pupils to do simulation that involves columns and rows 2.3.1 to show the commutative law a x b = b x a. T • Emphasise that the product will be the same even though the position of the multiplied numbers change. AB 56-57 • Surf https://www.ixl.com/math/grade-2/count-equal-groups

3 Calculate the number of buttons in each group. 4 groups of five 5 groups of four 5+5+5+5= 4+4+4+4+4= 4 × 5 = 5 × 4 = 4× =5× LET’S ANSWER Complete the number sentences. ab groups of +++ += ×= × groups of 2.3.1 += ×= ×= 83 T EACHENRO’TSES • Guide pupils to do a simulation of arranging groups of objects AB 58 to show the multiplication operation that gives the same product. • Surf http://www.worksheetfun.com/Multiplication%20times%20table/ addandmultiplysquarestwo_2.pdf

BUILD UP TIMES TABLES 1 2 times table Oh, I have 2 1×2= 2 antennae! 2×2= 4 I write 3×2= 6 6 × 2 = 12 4×2= 8 like this. 5 × 2 = 10 6 × 2 = 12 7 × 2 = 6 8×2= ×2 9×2= 1 2 0 2 4 6 8 10 12 14 16 18 2 3 times table 1×3= 3 2×3= 6 My brother’s 3×3= 9 bicycle has 4 × 3 = 12 3 wheels. 5 × 3 = 15 6 × 3 = 18 What is the number for the fifth step? 7 × 3 = 8 × = 24 × 3 = 27 0 1 2 3 4 5 6 7 8 9 10 11 12 84 EACHENRO’TSES • Guide pupils to construct a 2 times table by counting in twos and 3 2.3.1 times table by counting in threes. T AB 59

3 4 times table Scan me 1 ×4= 4 2×4= 8 9:00 3 × 4 = 12 4 × 4 = 16 5 5 × 4 = 20 ×4 6×4= 7 × = 28 20 8 × = 32 × 4 = 36 5 × 4 = 20 0 4 8 12 16 20 4 5 times table 1 ×5= 5 2 × 5 = 10 0 5 10 15 20 3 × 5 = 15 4 × 5 = 20 4 × 5 = 20 5 × 5 = 25 6 × 5 = 30 7 × 5 = 8 × = 40 × 5 = 45 The hibiscus has 5 petals. T EACHENRO’TSES • Guide pupils to relate the 4 times table with the 2 times table through 2.3.1 AB 60-62 simulation involving groups with members of the same number. 85 • Explain the number pattern of products of the 5 and 4 times tables. • Surf https://www.ixl.com/math/grade-2/write-multiplication-sentences -for-number-lines

5 6 times table Each tray has 6 chocolates. Number of trays 1 2 3 4 5 6 7 8 9 Number of 6 12 18 24 30 36 chocolates 1 ×6= 6 2 × 6 = 12 3 × 6 = 18 4 × 6 = 24 5 × 6 = 30 6 × 6 = 36 7 × = 42 × 6 = 48 ×6= 0 6 12 18 24 30 48 54 86 EACHENRO’TSES • Guide pupils to construct a 6 times table by counting in sixes. 2.3.1 • Guide pupils to relate the 6 times table with the 3 times table. T • Surf http://www.education.com/worksheet/article/times-table-6/ AB 63

6 7 times table One steaming tray How many has 7 steamed buns. steamed buns are there in the 3 steaming trays? 00:9 Scan 1 × 7 = 7 me 2 × 7 = 1 4 3 × 7 = 21 9:00 4 × 7 = 28 5 × 7 = 35 6 × 7 = 7 × = 49 × 7 = 56 × 7 = 0 7 14 21 28 35 42 49 T EACHENRO’TSES • Guide pupils to construct a 7 times table by counting in sevens using 2.3.1 AB 64 concrete materials. 87 • Ask pupils to creatively make a times table card on their own. • Surf http://www.education.com/worksheet/article/times-table-7/

7 8 times table 1 ×8= 8 2 × 8 = 16 I have 3 × 8 = 24 8 legs. 4×8= 5×8= 6 × = 48 7 × = 56 × 8 = 64 × 8 = 72 0 8 16 24 32 56 LET’S EXPLORE I built the 2 times table 2 4 6 8 10 6 times table +++++ from the 2 times table and the 4 times table 4 8 12 16 20 4 times table. 6 times table 6 12 18 24 30 Build a 5 times table. Use the 2 times table and the 3 times table. 88 EACHENRO’TSES • Guide pupils to construct an 8 times table by counting in eights 2.3.1 and relate it with a 4 times table. T • Guide pupils to carry out the Let’s Explore activity. AB 64 • Surf http://www.education.com/worksheet/article/times-tables-8/

8 9 times table 1×9= 9 Look at the coloured Every card 2 × 9 = 18 digits. has 9 beads. 3 × 9 = 27 Explain this multiplication 4 × 9 = 36 pattern. 5 × 9 = 45 6 × 9 = 54 7 × = 63 × 9 = 72 × 9 = 0 9 18 27 36 1 ×9= 9 4 × 9 = 36 2 × 9 = 18 3 × 9 = 27 1 +8=9 2+7=9 The total of the digits in the answer is 9. 1 23 6 78 9 times table 2 1 4 56 45 9 1 23 7 12 56 7 1 34 8 1×9= 9 2 × 9 = 18 3 × 9 = 27 EACHENRO’TSES • Guide pupils to construct a 9 times table by counting in nines. 2.3.1 AB 65 • Discuss the arrangement of ones and tens digits in the 9 times table for T 89 pupils to remember easily. • Surf https://www.superteacherworksheets.com/multiplication/nines- trick.pdf?up=1466611200

LET’S ANSWER 1 Multiply. Complete the answers. a b= 1 ×7 20 = 4 8 3 = 6 ×4 ×5 3 ×3 =6 9 7= 2 ×5 = 2 Find the paths with the same total. Which animals will meet each other? 24 12 36 6×4 8+8+8 6+6 4×9 4+4+4 4×6 9+9+9+9 4×3 2×6 3+3+3+3 3×8 6×6 9×4 90 EACHENRO’TSES • Guide pupils to construct the 2 times table until the 9 times table. 2.3.1 • Encourage pupils to do the times table mentally. T • Surf http://www.multiplication.com/games/play/car-wash AB 66-67 • Surf http://www.math-play.com/math-racing-multiplication-game/ math-racing-multiplication_html5.html

BUILD UP 1, 0 AND 10 TIMES TABLES 1 1 times table 1×1= 1 2×1= 2 Each 3×1= 3 plate 4×1= 4 has 5×1= 5 1 baulu. 6×1= 6 7 × 1 = Any number 8× = 8 times 1 equals the number itself. ×1= 9 2 0 times table 0+0+0=0 1 ×0=0 3×0= 0 2×0=0 There is 3×0=0 none in 0+0+0+0+0=0 4×0=0 every ×= 5×0=0 container. 6×0=0 7 × = 0 Any number times 0 equals 0. ×0=0 ×0=0 EACHENRO’TSES • Guide pupils to understand 1 times table and 0 times table by carrying 2.3.1 out a simulation using concrete materials. T 91

3 10 times table 10 times table 1 row has 10 beads. 1 × 10 = 10 2 rows have 20 beads. 2 × 10 = 20 3 × 10 = 30 4 × 10 = 40 5 × 10 = 6 × 10 = 7 × = 70 Explain the relation × 10 = 80 between 1 times table and 9× = 10 times table. 1 10 + 10 + 10 + 10 + 10 times table times table 1 ×1= 1 1 × 10 = 10 0 10 20 30 40 2×1=2 2 × 10 = 20 4 × 10 = LET’S ANSWER 00:9 Complete these. c 5× =0 a 4 × 10 = b = 8 × 0 d 7 × = 70 Scan me e 50 f4 9:00 53 46 9 ×10 7 8 ×1 0 24 137 92 EACHENRO’TSES • Guide pupils to construct a 10 times table by counting in tens. 2.3.1 T • Surf https://www.mathworksheets4kids.com/multiplication/facts/ 2.3.2 single-number-column-large.png AB 68-69