Page 220 - Start Up Mathematics_5

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Composite numbers: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 2. (a) 1 10 (b) 4 (c) 3 (d) 6 (e) 7 (f) 6 11
20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 11 4 8 9 5 13
39, 40, 42, 44, 45, 46, 48, 49, 50 3. (a) 11 (b) 17 (c) 28 (d) 22 (e) 49 (f) 28
Co-prime numbers: 2 and all odd numbers, (3, 5), 5 2 3 5 6 5
(3, 4), (3, 7), (3, 8), (3, 10), (3, 11), (3, 13), (3, 14), (3, 17), Ascending order: 2 , 4 , 5 , 8 , 7 , 9 1
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(3, 19) and so on. 5 5 5 6 2 3
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Exercise 3.3 4. (a) 7 (b) 15 (c) (d) (e) 14 (f) 7
1. (a) 12 (b) 45 (c) 6 (d) 4 (e) 12 (f) 40 9 8 7 4 3 4
2. (a) 4 (b) 2 (c) 2 (d) 2 (e) 5 (f) 2 5. (a) 103 (b) 37 (c) 13 (d) 71 (e) 37
84 4 6 7 8
Exercise 3.4
1. (a) 36 (b) 220 (c) 96 (d) 1,155 (e) 2,496 Exercise 4.1
(f) 6,006 (g) 7,056 (h) 960 (i) 4,125 1. (a) 4 > (b) 7 > 8 (c) 14 < 9 (d) 21 > 17
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2. (a) 112 (b) 396 (c) 1,664 (d) 360 (e) 30 7 9 11 15 25 15 32 26
(f) 240 (g) 2,800 (h) 26,973 (e) 30 < 17 (f) 4 < 4 (g) 8 < 11
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3. 5 4. 64 23 7 7 5 13 15
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Exercise 3.5 (h) < 7 (i) 8 < 5
1. 42 2. 3 3. 3 times 4. 1,105 5. 576 9 10 17 7
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2. (a) 3 < (b) 9 < 11 (c) 15 > 17
Let’s Evaluate 8 7 13 14 24 32
1. (a) divisible by 3 (b) divisible by 5 and 11
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(c) divisible by 2, 4, 5, 8, 10 (d) 13 > 17 (e) 31 < 28 (f) 6 11 > 5 13
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(d) divisible by 2, 3, 4, 6, 8, 9
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(e) divisible by 2, 3, 4, 5, 6, 10 (g) > 6 (h) 5 < 11 (i) 2 < 8 7
(f) divisible by 2, 3, 6, 9 7 13 9 14 5 9
2. Yes 3. (a) = (b) < (c) > (d) > (e) > (f) >
3. (a) 2 (b) 5 (c) 5 (g) < (h) < (i) <
4. (a) 3,520 (b) 5,720 (c) 30,800
5. (a) True (b) False (c) False (d) True Exercise 4.2
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1. (a) 7 , 15 16 21 24 32
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Scratch Your Brain 38 38 38 38 38 38
1. 630 2. 548 3. 9,600 4. 23
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(b) 8 , 15 24 37 48 51
Assessment Sheet 1 53 53 53 53 53 53
92 108 111
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I. Choose the correct answer. (c) 115 115 115 115 115 115
1. (c) 2. (b) 3. (a) 4. (b) 5. (d) 6. (b) 7. (c) 8. (b)
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(d) 15 38 43 56 72
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II. Solve mentally and answer. 94 94 94 94 94
1. 10 10 26 39 44 51
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2. Five million seven hundred eight thousand one (e) 86 86 86 86 86
hundred ninety-two
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3. 60,00,00,000 + 8,00,00,000 + 1,00,000 + 90,000 + 5,000 + (f) 63 , 77 , 87 , 90 124
200 + 40 + 6 144 144 144 144 144
4. False 5. 90,889 6. 7,92,135 2. (a) 42 37 33 29 11 , 5
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7. 1, 2, 4, 13, 26, 52 8. 25, 50, 75, 100 9. 12 46 46 46 46 46 46
10. 504 68 63 52 44 34 29
(b) , , , , ,
Chapter 4: Fractions—Addition and Subtraction 71 71 71 71 71 71
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Let’s Recall (c) 244 220 132 105 98 , 39
247 247 247 247 247 247
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1. 18 27 36 ; No (d) 218 121 119 107 72
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22 33 44 315 315 315 315 315
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