Page 187 - Math Skill - 4

Answers 185

Exercise 7.4

1. (a) 828 L 899 mL (b) 73 m 25 cm (c) 77 kg 800 g 2. (a) 53 km 040 m (b) 697 kg 789 g (c) 48 L 475 mL
3. (a) 6 L 050 mL (b) 13 L 950 mL (c) 12 kg 950 g (d) 12 kg 830 g (e) 460 km 279 m (f) 10 kg 825 g
4. (a) 7 L 025 mL (b) 32 L 145 mL (c) 12 kg 645 g (d) 25 kg 150 g (e) 11 km 195 m (f) 22 m 37 cm

Exercise 7.5
(a) 23 m 75 cm (b) 34 m 50 cm (c) 87 cm 5 mm (d) 83 m 70 cm (e) 66 m 75 cm (f) 39 kg 705 g (g) 98 L 100 mL (h) 45 L 750 mL
Exercise 7.6

(a) 50 m (b) 1 m 04 cm (c) 1 m 04 cm (d) 11 m 05 cm (e) 2 kg 10 g (f) 1 kg 500 g (g) 3 L 150 mL (h) 525 mL
Exercise 7.7
1. 8 L 250 mL 2. 61 kg 450 g 3. 612 L 950 mL 4. 10 kg 950 g 5. 23 kg 450 g 6. 6 L 625 mL 7. 15 m 10 cm 8. 875 g
Assessment Time
A. 1. (b) 2. (c) 3. (a) 4. (a) 5. (b)
B. 1. 15000 m 2. 754 mm 3. 152000 mL 4. 47000 g 5. 4 L 325 mL 6. 2942 cm 7. 5 kg 372 g 8. 139020 m
C. 1. SI system 2. 1 kilometer > 1 decameter > 1 meter > 1 centimeter > 1 millimeter 3. meter (m)
Chapter 8: Money
Boot-up : ` 120 × 4 = ` 480; ` (500 – 480) = ` 20; (a) (iii), (b) (i), (c) (iv), (d) (ii)
Exercise 8.1

1. (a) 2560 p (b) 10980 p (c) 50005 p (d) 37358 p (e) 9750 p (f) 199 p 2. (a) 1599 p (b) 2705 p (c) 16590 p
(d) 123456 p (e) 109 p (f) 203175 p 3. (a) ` 23 rupees 45 paise (b) ` 124 rupees 79 paise (c) ` 6 rupees 85 paise
(d) ` 78 rupees 34 paise (e) ` 12 rupees 04 paise (f) ` 50 rupees (g) ` 163 rupees 25 paise (h) ` 89 rupees 75 paise
Exercise 8.2
1. (a) ` 2.00 (b) ` 5.00 (c) ` 3.00 (d) ` 145 (e) ` 270 2. (a) She needs ` 20 more 3. ` 101 4. ` 10, ` 5, ` 2 and ` 1
Exercise 8.3

1. (a) ` 2689.30 (b) ` 5352.37 (c) ` 2074.77 2. (a) ` 857.16 (b) ` 1869.90 (c) ` 1319.10 3. ` 3404.45 4. ` 1089.39
5. ` 6560.35 6. ` 6397.45 7. Colour box costs more by ` 383.50 8. ` 2773.60, ` 226.40
Exercise 8.4

1. (a) ` 106.08 (b) ` 139.50 (c) ` 601.90 (d) ` 1664.64 2. (a) ` 11.47 (b) ` 90.10 (c) ` 240.05
3. ` 13.02 4. ` 142 5. ` 60 6. ` 15.25 7. ` 606.90 8. ` 125.10
Exercise 8.5

1. Do it yourself. 2. (a) ` 560 (b) ` 180 (c) ` 750 (d) ` 240
Assessment Time
A. 1. (b) 2. (c) 3. (c) 4. (b) 5. (c) B. 1. `, p 2. 100 3. 1925 4. 7065 5. 97.34 C. 1. (ii) 2. (iii) 3. (i) 4. (ii)

Chapter 9: Time
Boot-up :
(a) (i) 8:00; (ii) 11:00 (b) (i) 3:30; (ii) 7:30 (c) (i) 5:15; (ii) 4:15 (d) (i) 10:30; (ii) 4:30

Exercise 9.1
1. (a) 4:00, 4 o’clock (b) 5:30, half past five (c) 2:45, quarter to three
11 12 1 11 12 1 11 12 1
10 2 10 2 10 2
2. (a) 9 3 (b) 9 3 (c) 9 3
8 4 8 4 8 4
7 6 5 7 6 5 7 6 5
Exercise 9.2
(a) 3:24 or twenty-four minutes past three (b) 6:42 or eighteen minutes to seven (c) 8:54 or six minutes to nine