Page 205 - Math Skill - 5

Answers 203

Exercise 7.1
1. (a) 60 (b) 480 (c) 6,230 (d) 34,800 (e) 2,04,510
2. (a) 300 (b) 6,23,100 (c) 10,10,100 (d) 6,700 (e) 5,700
3. (a) 24,000 (b) 1,84,000 (c) 5,63,000 (d) 13,50,000
4. (a) 2,00,000 (b) 7,00,000 (c) 11,00,000 (d) 1,64,00,000
5. (a) 13,00,00,000 (b) 6,00,00,000 (c) 8,00,00,000 (d) 33,00,00,000

Exercise 7.2
1. (a) 7 (b) 7 (c) 13 (d) 64 (e) 19 2. (a) 5.7 (b) 8.7 (c) 10.3
(d) 76.7 (e) 34.8 3. (a) 0.31 (b) 6.24 (c) 12.15 (d) 16.89 (e) 123.77
4. (a) 42.404 (b) 62.413 (c) 89.473 (d) 3.166 (e) 0.789 (f) 18.004 5. (a) 0.74 (b) 1.99
(c) 0.32 (d) 2.46 (e) 2.38 6. (a) 0.353 (b) 0.714 (c) 0.273

Assessment Time

A. 1. (a) 2. (c) 3. (a) 4. (b) B. 1. 6.4 2. 4209000 3. 19.9 4. 60 5. 78.97
C. 1. 16,68,00,000 2. 3,27,53,000; 9,50,65,000; 1,77,83,000; 4,37,30,000, 16,67,92,000; 71,27,000
3. 5,05,36,200 D. 1 (a) 2. (a)

CHAPTER - 8: PERCENTAGE, PROFIT AND LOSS

Boot-up 1. 10 2. 45 3. Do yourself 4. Do yourself
100 100
Exercise 8.1
3 14 17 3 2 19 1 1 12 9 1
1. (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) = 2
10 75 20 4 5 200 50 12 25 4 4
2. (a) 87.5% (b) 525% (c) 32% (d) 25% (e) 7% (f) 230% (g) 38% (h) 18%

Exercise 8.2
1. (a) 25% (b) 73% (c) 25.5% (d) 62.7% (e) 4% (f) 105% (g) 820% (h) 950%
2. (a) 0.24 (b) 0.75 (c) 0.0035 (d) 0.003 (e) 0.0625

Exercise 8.3
1. (a) 88 (b) 13.2 (c) 30.5 (d) 12.8 2. (a) 126.44 kg (b) 35.112 m (c) 133 km
(d) 18 cm (e) 161.5 L (f) 54 g 3. (a) 60% (b) 9% 4. 500 m 5. ` 125

Exercise 8.4
1. Zinc = 924.5 g, Iron = 1225.5 g 2. 65% 3. 960 students failed 4. ` 540 5. 12% 6. 640

Exercise 8.5
1. (a) ` 100 (b) ` 1020 (c) ` 200
2. ` 30 3. ` 14,352 4. ` 725 5. ` 1738 6. profit 33.34%
Assessment Time

A. 1. (a) 2. (c) 3. (a) 4. (b) 5. (a) B. 1. Loss 2. Profit 3. Profit; Loss
C. 1. (iii) 2. (i) 3. (ii) D. 1 (a) 2. (c)