Page 255 - Math Genius C4

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\ 03-Oct-2025 Bharat arora P-9 Reader’s Sign _______________________ Date __________

Challenge Question (Page 174) Challenge Question (Page 190)
5; 50 g (18 cm, 20 cm), (10 cm, 28 cm), (5 cm, 33 cm), etc. (Answer may vary)
Practice time 9C think tank (Page 192)
1. (a) 26000 g (b) 320045 g (c) 45000 mg (d) 140203 mg 2. (a) False (b) False (c) False
2. (a) 9145 g (b) 20498 g Practice time 10B
3. (a) 9 kg (b) 4 kg 323 g (c) 3 kg 65 g (d) 25 g 605 mg 1. A=12 sq. cm, B=4 sq. cm, C=6 sq. cm, D=16 sq. cm, E=16 sq. cm,
4. (a) 140 quintals (b) 12500 kg (c) 120 tons (d) 13800 kg F=15 sq. cm, G=10 sq. cm
Challenge Question (Page 176) 2. (a) 5 sq. units (b) 8 sq. units (c) 4 sq. units (d) 6 sq. units
650 g; Add: 250 g (or 0.25 kg) (e) 13 sq. units (f) 7 sq. units
Practice time 9D Chapter assessment
1. (a) (iii) (b) (iii) (c) (i) (d) (ii) (e) (i)
1. (a) 621 kg 555 g 343 mg (b) 939 kg 801 g 733 mg 2.
(c) 262 kg 635 g 105 mg (d) 376 kg 292 g 10 mg (a) 20 cm (b) 18 cm (c) 25 cm (d) 24 cm
2. (a) 61 kg 611 g (b) 54 kg 1 g 3. (e) 16 cm (f) 20 cm
(c) 64 kg 479 g 25 mg (d) 360 kg 141 g 420 mg (a) P = 12 cm; A = 8 sq. cm (b) P = 16 cm; A = 16 sq. cm
(c) P = 12 cm; A = 6 sq. cm
(d) P = 14 cm; A = 9 sq. cm
3. (a) 2 kg 16 g (b) 40 kg 665 g 630 mg 4. (a) 24 sq. cm (b) 30 sq. cm (c) 18 sq. cm
(c) 7 kg 11 g 701 mg (d) 239 kg 976 g 415 mg
5. (a) 18 sq. cm (b) 15 sq. cm 6. 750 m 7. 44 cm
Fast Check (Page 177) 8. 88 m 9. 24 cm
4000 mL Challenge Question (Page 196)
Practice time 9e 32 cm
1. (a) 16000 mL (b) 1100 mL (c) 15350 mL (d) 1680 mL Chapter 11. time
2. (a) 3 L 500 mL (b) 8 L 756 mL (c) 9 L 767 mL (d) 1 L 808 mL Let’s ReCaLL
3. (a) 26000 L (b) 3000 L (c) 1560 L (d) 12470 L 1. (a) 120 (b) 24 (c) 140 (d) 1095
(e) 6365 L (f) 6954 L 2. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
4. (a) 13 kL (b) 12 kL (c) 6 kL 352 L (d) 2 kL 8 L Practice time 11a
5. 20, 10 mL
1. (b) 12:13, 13 minutes past 12, 47 minutes to 1
Practice time 9F (c) 5:30, 30 minutes past 5, 30 minutes to 6
1. (a) 15 kL 198 L 352 mL (b) 120 L 795 mL (c) 17 kL 330 L 6 mL (d) 2:40, 40 minutes past 2, 20 minutes to 3
2. (a) 79 L 30 mL (b) 51 kL 299 L (c) 17 kL 97 L 820 mL (e) 7:16. 16 minutes past 7, 44 minutes to 8
(d) 25 kL 25 L 521 mL (f) 9:15, 15 minutes past 9, 45 minutes to 10
3. (a) 71 L 20 mL (b) 4 kL 12 L (c) 17 kL 576 L 330 mL (g) 6:45, 45 minutes past 6, 15 minutes to 7
(d) 16 kL 981 L 78 mL (h) 11:10, 10 minutes past 11, 50 minutes to 12
4. 251 L 700 mL 5. 7 kL 50 L 6. 2 kL 500 L Practice time 11B
Mental Maths (Page 181) 1. 50 seconds 10 seconds 25 seconds
1. 2000 2. 2 3. 100 4. 6 km 500 m 5. 2500
Practice time 11C
Chapter assessment 1. (a) 03:34 hours (b) 16:50 hours (c) 19:30 hours (d) 10:00 hours
1. (a) (iii) (b) (i) (c) (iii) (d) (ii) (e) (iv) (e) 00:00 hours or 24:00 hours (f) 18:34 hours
2. (a) 50, 5000 (b) 4100, 4100000 (c) 11000, 11000000 2. (a) 4:20 p.m. (b) 6:57 p.m. (c) 8:20 p.m. (d) 4:30 a.m.
(d) 165 (e) 1, 6 (e) 10:00 p.m. (f) 8:08 a.m.
3. (a) False (b) True (c) False (d) True (e) False 3. (a) Renu wakes up at 6:45 a.m. (b) A bus leaves ISBT at 2:45 p.m.
4. 1200 mL or 1 L 200 mL 5. 4 m 20 cm (c) A hawker starts distributing newspapers at 5:35 a.m.
6. 31 L 392 mL 7. 145 kg 670 g 8. 76 kg 495 g 9. 6 kg (d) A match starts at 5:30 p.m. (e) Golu reached Agra at 8:10 p.m.
10. (a) 8, 586 (b) 7, 816 (c) 7, 716 (d) 7, 242 (e) 6, 992 4. 12-hour format–4:30 p.m. and 24-hour format–16:30 hours
Challenge Question (Page 183) Practice time 11D
Anaya = 172 cm Rehan = 170 cm 4 mm 1. (a) 360 minutes (b) 510 minutes (c) 18000 seconds
Maya = 174 cm 6 mm Siya = 168 cm (d)1080 seconds (e) 1695 seconds (f) 53280 seconds
Ascending order: 168 cm < 170 cm 4 mm < 172 cm < 174 cm 6 mm 2. (a) 3 minutes 36 seconds (b) 40 minutes 48 seconds
(c) 1 hour 4 minutes 20 seconds (d) 2 hours
Chapter 10. Perimeter and area
Practice time 11e
Practice time 10a 1. (a) 53 minutes 55 seconds (b) 29 minutes 38 seconds
1. (a) 26 units (b) 28 units (c) 28 units (d) 26 units (c) 58 minutes 18 seconds (d) 46 minutes 5 seconds
(e) 28 units (f) 24 units (e) 41 hours 51 minutes 30 seconds OR 1 day 17 hours 51 minutes 30
2. (a) 19 cm (b) 26 cm (c) 16 cm (d) 31 m seconds
(e) 20 cm (f) 25 cm (f) 106 hours 5 minutes 8 seconds OR 4 days 10 hours 5 minutes 8
3. 24 cm 4. 48 cm 5. 160 cm 6. 28 cm seconds

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