P4 Maths WB Unit- 1 (1)

1 Exercise (1.1) Fill in the blanks. 1. (a) 40 000 + 2000 + 100 + 8 = (b) 562 000 + 32 = (c) 700 000 + 70 000 + 70 +7 = (d) 900 000 + 214 = 2. (a) 25 830 = 25 000 + + 30 (b) 370 049 = + 70 000 + 40 + 9 (c) 603 804 = 600 000 + + 800 + 4 (d) 416 008 = 416 000 + 3. Complete the following number patterns. (a) 35 552, , , 37 052, 37 552 (b) 71 680, 76 680, , 86 680, (c) 28 361, 29 361, , , 32 361 4. Rearrange each of digits to make the greatest possible number and the smallest possible number. Greatest number Smallest number 9, 6, 4, 1, 3 1, 1, 6, 8, 7 5. Write >, < or = in each circle. (a) 13 268 31 862 (b) 49 650 42 650 (c) 33 856 - 1000 30 856 (d) 65 730 + 1000 66 730 Primary Four 1

Exercise (1.2) 1. Write the following in figures. (a) Three million (b) Four million, one hundred and fifty thousand (c) Six million and thirty-one thousand (d) Seven million, two hundred and eight thousand (e) Five million and five thousand (f) Nine million, nine hundred and nine thousand (g) Ten million 2. Write the following in words. (a) 4 000 000 (b) 3 040 000 (c) 6 350 000 (d) 5 006 000 (e) 7 703 000 (f) 9 099 000 (g) 8 567 000 3. Write the following in figures. (a) 6 milliions (b) 5 milliions 605 thousands (c) 7 millions 80 thousands (d) 4 millions 2 thousands 2 Primary Four

4. Fill in the blanks. (a) 3000 = tens (b) 5000 = hundreds thousands (c) 4200 = hundreds (d) 6000 = thousands (e) 56 000 = thousands (f) 72 000 = 5. Fill in the blanks. thousands thousands (a) 3 564 000 = millions thousands = thousands (b) 2 078 000 = millions thousands = thousands (c) 6 004 000 = millions thousands = (d) 5 500 000 = millions thousands = 6. Add. 2 millions 600 thousands + 38 thousands millions thousands (a) = 4 millions 500 thousands + 260 thousands. millions thousands (b) = 3 millions 400 thousands + 800 thousands millions thousands (c) = 5 millions 450 thousands + 650 thousands millions thousands (d) = 4 millions 230 thousands + 880 thousands millions thousands (e) = 7. Subtract. (a) 3 millions 500 thousands -- 300 thousands = millions thousands (b) 5 millions 620 thousands -- 480 thousands. = millions thousands (c) 4 millions -- 200 thousands = millions thousands (d) 3 millions -- 40 thousands = millions thousands (e) 4 millions 200 thousands -- 750 thousands = millions thousands Primary Four 3

Exercise (1.3) 1. Is 4 a factor of 110? As 110 cannot be divided by 4 exactly, 4 is not a factor of 110. 27 4 110 E 80 30 28 2 2. Find the factors of 84. 84 = 1 × 84 = 2 × 42 = 3 × 28 = .......... 3. Find the factors of each number. Y (d) 144 (a) 36 (b) 64 (c) 124 4. Is 6 a common factor of 54 and 132? 5. List the first 12 multiples of 5. 5, 10, 15, 20, ... 6. Is 48 a common multiple of 6 and 8? I 7. Give a common multiple of 5 and 8. The multiples of 8 are 8, 16, 24, 32, 40, ... 40 is also a multiple of 5. H8. Give a common multiple of 3, 4 and 9. 4 Primary Four

Exercise (1.4) 1. Write the following in words. (a) 7 000 000 (b) 3 450 000 (c) 6 020 000 (d) 4 003 000 2. Write the following in figures. (a) 5 millions (b) 4 millions 230 thousands (c) Ten million (d) Eight million and eight thousand 3. Richard bought an apartment for $835 000. How many thousands are there in 835 000? 4. What is the greatest whole number that can be placed in each ? (a) 75 + < 100 (b) - 97 < 100 5. Find the factors of each number. (a) 56 (b) 72 (c) 100 (d) 120 6. Give a common factor of each pair of numbers. (a) 12 and 72 (b) 18 and 57 (c) 48 and 84 7. List the first four multiples of each number. (a) 5 (b) 7 (c) 8 (d) 9 8. Give a common multiple of each set of numbers. (a) 3 and 5 (b) 6 and 8 (c) 4, 6 and 9 9. Find the missing factors. (b) 5 × = 120 (a) × 6 = 84 (d) × 5 = 75 (f) 6 × (c) × 3 = 99 = 132 (e) 4 × = 116 Primary Four 5

Exercise (1.5) 1. There are 487 pages in a book. Round off the number of pages to the nearest ten. 485 487>485 480  490 487  Y 2. Round off each number to the nearest 10. (a) 604 (b) 795 (c) 999 3. 5714 people visited a book fair. Round off the number of visitors to the nearest hundred. 5750 5700  5800 5714<5750 5714  H 4. Round off each number to the nearest 100. (a) 3650 (b) 6047 (c) 4995 5. Round off 16 500 to the nearest thousand. 16 000 16 500 17 000 Y  16 500  16 500 is halfway between 16 000 and 17 000. We take 17 000 as the nearest 1000. 6. Round off each number to the nearest 1000. (a) 23 490 (b) 54 550 (c) 39 900 To round off a number to the nearest thousand, we look at the digit in the hundreds place. If it is 5 or greater than 5, we round up; if it is smaller than 5, we round down. 6 Primary Four

7. Round off each number to the nearest 1000. (a) 49 287  thousands (b) 73 501 thousands (c) 804 390  thousands (d) 129 500 thousands 8. Find the value of 1800 ÷ 3. 18hundreds÷3 = 6hundreds 1800 ÷ 3 = E Exercise (1.6) 1. Round off each number to the nearest 10. (a) 72 (b) 655 (c) 1289 2. Round off each number to the nearest 100. (a) 342 (b) 1259 (c) 20 753 3. Round off each number to the nearest 1000. (a) 6850 (b) 10 500 (c) 125 498 4. Aung Aung bought a television set for $849. Round off this amount to the nearest hundred dollars. 5. Peter bought a car for $69 500. Round off this amount to the nearest thousand dollars. 6. A spaceship travelled 999 540 km. Round off this distance to the nearest 1000 km. 7. Round off each of the following to the nearest 1000. (a) 6638  thousands (b) 20 702  thousands (c) 156 499  thousands (d) 349 750  thousands. Primary Four 7

Exercise (1.8) thousands 1. Add. (a) 27 thousands + 9 thousands = 27 000 + 9000 = (b) 8000 + 5000 = 2. Subtract. thousands (a) 53 thousands - 4 thousands = 53 000 - 4000 = (b) 6000 - 2000 = (c) 45 000 - 6000 = 3. Multiply. (b) 602 × 100 = (a) 254 × 10 = (d) 57 × 1000 = (c) 93 × 40 = 4. Divide. (b) 4200 ÷ 100 = (a) 360 ÷ 10 = (d) 5600 ÷ 800 = (c) 250 ÷ 50 = 8 Primary Four

Exercise (1.10) 1. Find the value of each of the following: (a) 140 - 40 × 3 (b) 40 - 14 - 9 (c) 12 × 10 - 5 (d) 51 - 35 + 18 (e) 7 × 5 × 8 (f) 96 ÷ 3 ÷ 4 (g) 14 × 9 ÷ 3 (h) 80 + 18 ÷ 6 2. Find the value of each of the following: (a) 70 + 24 ÷ 6 - 4 (b) 125 ÷ 5 - 12 × 2 (c) 160 - 60 ÷ 4 × 3 (d) 32 +8+30 ×2 (e) 52 - 35 ÷ 7 - 7 × 2 (f) 9 × 8 - 6 × 10 (g) 7 × 8 + 24 ÷ 8 (h) 63 ÷ 9 + 20 ÷ 10 3. Find the value of each of the following: (a) 69 + (46-15) (b) 90 - (24+36) (c) 52 - (40 - 22) (d) (31-20)-8 (e) 8 × (3×2) (f) 84 ÷ (4 ÷ 2) (g) 9 × (20 ÷ 5) (h) 45 ÷ (15×3) 4. Find the value of each of the following: (a) (19+16)÷5 (b) 12×(9-4) (c) 64÷(8-6) (d) (14+6)×5 (e) 10×(15÷5) (f) (100-44)÷7 (g) 72÷(9-3) (h) (28-18)×10 (i) 60+(18+7)÷5 (j) 8×(11-8)÷6 (k) 24÷6+3×(6-4) (l) 30+(28-8)÷5×2 Primary Four 9