Page 188 - Math Skill - 4

186 Maths

Exercise 9.3
1. (a) a.m. (b) a.m. (c) p.m. (d) p.m. (e) p.m. (f) p.m. 2. (a) 5:45 p.m. (b) 2:10 p.m. (c) 6:20 a.m. (d) 11:15 p.m.
(e) 12:05 a.m. (f) 3:25 a.m. 3. (a) 10:30 p.m. (b) 4:15 p.m. (c) 9:15 p.m. (d) 8:30 a.m. (e) 11:45 p.m. (f) 5:45 a.m.
Exercise 9.4
1. (a) 3:30:10 (b) 3:10:25 (c) 3:45:10 2. (a) 11:15:10 (b) 10:09:45 (c) 6:10:20 (d) 7:04:16 3. 35 minutes
4. 6 hours 30 minutes 5. 2 hours 15 minutes 6. 2 hours 50 minutes 7. 2:10 p.m. 8. 1 hour 50 minutes
Exercise 9.5
1. (a) 376 min (b) 1224 min (c) 1086 min (d) 3720 min (e) 2575 min (f) 2121 min 2. (a) 1800 s (b) 720 s
(c) 1500 s (d) 315 s (e) 21624 s (f) 1338 s 3. (a) 144 h (b) 72 h (c) 168 h (d) 74 h
(e) 51 h (f) 106 h 4. (a) 7 h (b) 15 min (c) 11 min 20 s (d) 6 days 6 hours

Exercise 9.6
1. (a) 0100 hours (b) 0000 hours (c) 1115 hours (d) 0223 hours (e) 0645 hours (f) 2355 hours
(g) 1200 hours (h) 1535 hours (i) 0710 hours (j) 1740 hours 2. (a) 7 hours 35 min (b) 1 hour 20 min
3. (a) 4:10 p.m. (b) 10:00 p.m. (c) 10:15 p.m. (d) 9:45 a.m. 4. 10:35 p.m. 5. 1 h 20 min
Exercise 9.7
1. (a) 10 h 50 min (b) 18 h 19 min (c) 11 h 59 min 2. (a) 4 h 7 min (b) 4 h 42 min (c) 4 h 10 min (d) 15 h 15 min
3. 4:30 p.m. 4. 2 h 40 min
Exercise 9.8
1. (a) 120 months (b) 156 months (c) 68 months 2. (a) 28 days (b) 84 days (c) 47 days 3. (a) 6 years 1 month
(b) 20 years (c) 92 weeks 6 days (d) 51 weeks 3 days 4. (a) Yes (b) No (c) Yes (d) Yes 5. December
6. 4th February 7. 5 months, 1 week and 3 days 8. 45 days

Assessment Time
A. 1. (b) 2. (c) 3. (b) 4. (a) 5. (b) B. 1. 11 2. 360 3. 3:00 4. 6 5. 1996 6. 7 7. 42 C. 1. (ii) 2. (i) 3. (i) 4. (iv)
Assessment–3
1. (c) 2. (a) 3. (a) 4. (a) 5. (b) 6. (a) 7. (c) 8. (c) 9. 12 10. 1875 11. 1000 12. 70 13. 139020 14. 5 kg
15. ` 692.5 16. ` 97.95 17. ` 727.50, ` 272.50 18. 9 km 300 m 19. 13 m 25 cm 20. watermelon, 775 kg
21. 2 hour 40 min 22. 7 Nov. 2023 23. 2 hour 20 min 24. 4:10 p.m. 25. 4 hour 45 min
th
Chapter 10: Geometry

Boot-up : (a) Square, 4, 4 (b) Rectangle, 4, 4 (c) Triangle 3, 3 (d) Circle, 0, 0
Exercise 10.1
1. (a) same (b) no (c) two (d) intersecting lines 2. & 3. Do it yourself. 4. (a) Parallel lines (b) Intersecting lines
Exercise 10.2
1. (a) Open (b) Closed (c) Closed (d) Open (e) Open (f) Open (g) Closed 2. (a) and (b) 3. (a) closed figures
(b) vertex (c) hexagon (d) 5, 5 (e) 7, 7 4. (a) ∠RQP (b) ∠XYZ (c) ∠NLM 5. (a) L and M (b) P, Q and R
Exercise 10.3
1. (a) center (b) longest (c) circumference (d) 2 (e) one 2. (a) (i) point O (ii) OR or OP or OQ
(iii) MN or PQ (iv) PQ (b) (i) Point X (ii) PX / XA / XB (iii) AC / AB (iv) AB
3. (a) P X (b) X P 4. (a) 24 cm (b) 28 cm (c) 50 cm (d) 100 cm (e) 200 cm
5. (a) 6 cm (b) 5 cm (c) 9 cm (d) 8 cm (e) 10 cm
M A N B C 6. (a) (i) AB (ii) AO (iii) BO (b) (i) MN (ii) MP (iii) NP
7. 50 cm, No
Q Y Q
Exercise 10.4
1. (a) (i) cube (ii) 6 (iii) 12 (iv) 8 (b) (i) cuboid (ii) 6 (iii) 12 (iv) 8 (c) (i) cone (ii) 2 (iii) 1 (iv) 1
(d) (i) cylinder (ii) 3 (iii) 2 (iv) 0 2. (c)