Page 199 - Start Up Mathematics_3

Exercise 4.4 (e) 77000 (f) 892000 (g) 100 (h) 10
1. (a) Actual value 2741, Estimated value 2800 (i) 3900 (j) 1000 (k) 920 (l) 93100
(b) Actual value 3263, Estimated value 3300 2. (a) 448 (b) 902 (c) 3328 (d) 8091 (e) 3886 (f) 2100
(c) Actual value 2924, Estimated value 2900 3. (a) 7300 (b) 462 (c) 3500 (d) 108000
(d) Actual value 1345, Estimated value 1300 4. (a) 405 (b) 2856 (c) 810 (d) 3212
2. 1950 kg 3. ` 3400 4. 175 chocolates 5. 61 kg (e) 4558 (f) 1014 (g) 2625 (h) 5888
6. ` 2190 7. Students to do on their own. 5. (a) 304 (b) 639 (c) 100 (d) 511
Let’s Evaluate (e) 396 (f) 891 (g) 385 (h) 320
1. (a) 3131 (b) 4209 (c) 2071 (d) 831 Exercise 5.5
2. (a) 3148 (b) 1423 (c) 3455 (d) 1076 1. (a) 120 (b) 180 (c) 630 (d) 400
3. (a) Th H T O (b) Th H T O (e) 1200 (f) 3200 (g) 1800 (h) 2000
8 7 4 2 6 7 1 2 2. 8 3. 36 4. 140 5. 1536
– 3 2 6 1 – 5 3 4 6 6. Students to do on their own.
5 4 8 1 1 3 6 6 Exercise 5.6
1. (a) ` 86 (b) ` 193 (c) ` 162 2. ` 270 3. 23 pens
4. 3778 5. 3160 6. (a) (iv) (b) (iii) (c) (ii) (d) (i) Let’s Evaluate
7. Students to do on their own.
Values and Life Skills 1. (a) 7 × 5 18 × 2 19 × 6 23 × 11 24 × 19
1. 2930 people 2. ` 722 (b) 10 × 4 12 × 9 13 × 9 29 × 7 38 × 13
Scratch Your Brain (c) 12 × 3 11 × 5 10 × 6 19 × 9 21 × 14
1. (a) 5768 (b) 13701 (c) 22559 (d) 19503 (d) 14 × 2 3 × 15 15 × 5 12 × 8 11 × 9
2. (a) 1275 students (b) 1031 pebbles
(e) 5 × 12 12 × 7 11 × 8 13 × 7 7 × 14
Chapter 5: Multiplication 2. (a) 1800 (b) 3354 (c) 6264 (d) 6447 (e) 864 (f) 7968
Let’s Recall 3. 4 × 8 = 32 (40 – 8) 8 × 8 = 64 (80 – 16)
1. (a) 16 (b) 21 (c) 24 (d) 36 5 × 8 = 40 (50 – 10) 9 × 8 = 72 (90 – 18)
(e) 40 (f) 12 (g) 42 (h) 56 6 × 8 = 48 (60 – 12) 10 × 8 = 80 (100 – 20)
(i) 64 (j) 45 (k) 81 (l) 100 7 × 8 = 56 (70 – 14)
2. (a) 27 (b) 82 (c) 340 (d) 528 4. (a) 1104 (b) 783 (c) 1472 (d) 1581
3. (a) 0 (b) 460 (c) 149 (d) 3 × 5 = 15 5. (a) 671 (b) 616 (c) 935 (d) 174
(e) 6 + 6 + 6 + 6 = 24 (f) 0 (g) 100 4. 375 6. 3220 7. 648
Exercise 5.1 8. Children to write on their own. 9. 308 marbles
1. (a) 66 (b) 117 (c) 5 (d) 6 (e) 11 10. Students to do on their own. 11. 1000
(f) 12 (g) 9 (h) 14 (i) 135 Scratch Your Brain
2. (b) 9, 6, 54 (c) 8 × 3, 24 (d) 11 × 9, 99 (e) 15, 10, 150; 1. 80 2. 648
Factors
Exercise 5.2 Let’s Recall Chapter 6: Division
1. (a) 7 (b) 11 (c) 0 (d) 1 (e) 0 (f) 16 1. (a) 4 (b) 2
2. 4 × 12 = 48 (40 + 8) 8 × 12 = 96 (80 + 16) 2. (a) 28 – 7 = 21 (b) 50 – 10 = 40
5 × 12 = 60 (50 + 10) 9 × 12 = 108 (90 + 18) 21 – 7 = 14 40 – 10 = 30
6 × 12 = 72 (60 + 12) 10 × 12 = 120 (100 + 20) 14 – 7 = 7 30 – 10 = 20
7 × 12 = 84 (70 + 14) 7 – 7 = 0 20 – 10 = 10
3. (b) 5 × 9 (c) 7 × 8 (d) 6 × 7 (e) 2 × 8 (f) 10 × 3 10 – 10 = 0
4. (a) 209 (b) 913 (c) 517 (d) 990 28 ÷ 7 = 4 50 ÷ 10 = 5
(e) 253 (f) 814 (g) 605 (h) 1056 (c) 48 – 8 = 40 3. (a) 20 ÷ 4 = 5, 20 ÷ 5 = 4
Exercise 5.3 40 – 8 = 32 (b) 56 ÷ 7 = 8, 56 ÷ 8 = 7
1. (a) 448 (b) 602 (c) 639 (d) 1448 (e) 4548 (f) 4536 32 – 8 = 24 (c) 6 ÷ 1 = 6, 6 ÷ 6 = 1
2. (a) 5592 (b) 2355 (c) 6272 (d) 6048 (e) 3871 24 – 8 = 16
(f) 3040 (g) 7136 (h) 4404 (i) 1782 (j) 3728 16 – 8 = 8
Exercise 5.4 8 – 8 = 0
1. (a) 280 (b) 1460 (c) 5900 (d) 31200 48 ÷ 8 = 6

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