Page 254 - Math Genius C4

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

Chapter assessment
7. Radius 8 cm 9 cm 2 cm 5 cm 4 cm
Diameter 16 cm 18 cm 4 cm 10 cm 8 cm 1. (a) (i) (b) (iii) (c) (ii) (d) (iv)
Challenge Question (Page 146) 2.
1. 8 cm 2. 16 cm
Chapter 8. symmetry and Patterns 3. (a) (b) (c) (d) (e)
Let’s ReCaLL
1. (a), (b)
4. (a) (b) (c)
2. (a) (b) 100000
think tank (Page 150)
1. yes; 0, 3 and 8 2. H, O, X (Answer may vary)
5. (a) (b) (c)
Practice time 8a
1. (a), (e), (f)
2. (a) (b) (c) (d)

6. (a), (d) 7. GHI, TSR 8. 4
3. (a), (c) 9. (a) 8000 + 1000 = 9000; 80000 + 10000 = 90000
Practice time 8B (b) 1234 × 9 + 5 = 11111; 12345 × 9 + 6 = 111111
(c) 3333 × 3 = 9999; 33333 × 3 = 99999
1. (b), (d), (e), (f)
(d) 24000 ÷ 8 = 3000; 240000 ÷ 8 = 30000
2. (a) (b)
10. (a) 5 14 10 15 25 12 9 6 5
(b) 20 18 25 1 7 1 9 14
(c) 19 20 1 25 16 15 19 9 20 9 22 5
(c) (d) 11. (a) HOW ARE YOU? (b) CHANGE IS GOOD
(c) PLANT MORE TREES
Chapter 9. Measurement
think tank (Page 155)
Let’s ReCaLL
34
1. (a) 4015 cm (b) 4200 g (c) 18180 mL
Practice time 8C
2. (a) 39 cm 4 mm (b) 37 kg 345 g (c) 44 L 250 mL
1. (a) 16, 19, 22, 25 (b) 39, 48, 57, 66 (c) 27, 31, 35, 39 (d) 64, 32, 16, 8 Challenge Question (Page 169)
2. (a) 1234 × 9 + 5 = 11111; 12345 × 9 + 6 = 111111
(b) 9876 × 9 + 4 = 88888; 98765 × 9 + 3 = 888888 3 cm 7 mm
(c) 12345 × 8 + 5 = 98765; 123456 × 8 + 6 = 987654 Practice time 9a
(d) 20000 ÷ 2000 = 10; 20000 ÷ 20000 = 1 1. (a) 6300 cm (b) 15000 cm (c) 1640 cm (d) 3005 cm
3. (a) 555, 5, 277775 (b) 333, 5 2. (a) 290 mm (b) 1800 mm (c) 163 mm (d) 258 mm
4. (a) 24 (b) 20 (c) 30 3. (a) 24000 m (b) 96000 m (c) 8417 m (d) 26042 m
Practice time 8D 4. (a) 390 dm (b) 1180 dm (c) 199 dm (d) 1092 dm
1. (a), (b), (e), (f) 5. (a) 1300 dam (b) 180 dam (c) 600 dam
6. (a) 2168 m (b) 12694 m
think & answer (Page 159)
7. (a) 10 cm 5 mm (b) 6 m 85 cm (c) 8 km (d) 16 km 300 m
1. I LOVE INDIA 8. (a) 216 in (b) 84 in (c) 9 ft (d) 11 ft 9 in
Practice time 8e Practice time 9B
1. (a) 2 5 8 5 18 5 14 15 23
1. (a) 42 km 361 m 4 cm (b) 475 m 73 cm 8 mm
(b) 2 5 12 9 5 22 5 9 14 25 15 21 18 19 5 12 6 (c) 76 km 600 m 52 cm 9 mm
(c) 4 15 9 20 14 15 23 2. (a) 53 km 834 m (b) 43 m 4 cm 9 mm (c) 108 km 276 m 5 cm
(d) 4 15 25 15 21 18 2 5 19 20 3. (a) 36 m 21 cm (b) 27 m 95 cm (c) 48 km 770 m 22 cm
(e) 4 18 5 1 13 19 3 15 13 5 20 18 21 5 (d) 58 km 203 m 44 cm
2. (a) FOCUS AND WIN (b) IT IS POSSIBLE 4. 8 m 74 cm 5. 281 km 248 m 6. 2232 km 500 m
(c) YES YOU CAN (d) NEVER GIVE UP 7. 2 km 950 m
Mental Maths (Page 159) think tank (Page 173)
1. (a) 2. (d) 3. (c) Both have the same weight.

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