Page 251 - Math Genius C5

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\ 08-Oct-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

Practice time 3C 2. (a) 84 (b) 144 (c) 110 (d) 1260 (e) 72 (f) 114
1. Divisible by (g) 180 (h) 300 (i) 160 (j) 66 (k) 120 (l) 96
Number 3. (a) 238 (b) 918 (c) 3198 (d) 75 (e) 270 (f) 72
2 3 4 5 6 9 10
(a) 1359 7 3 7 7 7 3 7 4. (g) 1440 (h) 240 (i) 504 (j) 60 (k) 495 (l) 72
(a) 96
(d) 144
(b) 504 (c) 180
(e) 234 (f) 54
(b) 1605 7 3 7 3 7 7 7 (g) 800 (h) 490
(c) 3420 3 3 3 3 3 3 3 5. (a) 10:52 p.m. (b) 11:15 p.m.
(d) 6543 7 3 7 7 7 3 7 6. 24 hair bands 7. 9:27 a.m. 8. 705
(e) 5004 3 3 3 7 3 3 7 Practice time 3G
(f) 7625 7 7 7 3 7 7 7
(g) 4790 3 7 7 3 7 7 3 1. HCF LCM Product of two numbers
(h) 5423 7 7 7 7 7 7 7 (a) 12 27 324
(i) 9963 7 3 7 7 7 3 7 (b) 4 252 1008
(j) 6739 7 7 7 7 7 7 7
(k) 8400 3 3 3 3 3 7 3 (c) 12 72 864
(d) 50 300 15000
2. (a) No (b) Yes (c) No
Practice time 3D 2. 25 3. 18 4. 30 5. 15
1. (a) False (b) False (c) True (d) True (e) False (f) False Mental Maths (Page 74)
2. (a) 97 (b) 2 (c) 25 (d) 2 × 2 × 2 × 2 × 2 (e) 9 1. (a) 2. (b) 3. (a) 4. (b) 5. (b)
3. (a) 18 (b) 28 Chapter Assessment
2 × 9 2 × 14 1. (a)-(iv) (b)-(ii) (c)-(iv) 2. 18 rows 3. 9 plants
4. 527253 → 572253 5. 600 cm 6. 10 cm 7. 2100 cm or 21 m
3 × 3 2 × 7 8. `6 9. 12:04 p.m.
(c) 32 (d) 40 10. 16 teams, each team having 3 girls and 2 boys 11. 132
2 × 16 2 × 20 Challenge Question (Page 77)
2 × 8 2 × 10 1. 131 (Answer may vary) 2. 24, 15 + 19 = 34 piles
2 × 4 2 × 5 Chapter 4: Fractions
2 × 2 Let’s ReCALL
(e) 64 (f) 90 1. (a) 3 ( b) 1 ( c) 1
4 4 2
2 × 32 2 × 45 3 1 1 3
2 × 16 3 × 15 2. 4 −= cup 3. 4
2
4
2 × 8 3 × 5 think tank (Page 83)
2 × 4 6 2 4 (Answer may vary)
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2 × 2 9 3 6
(g) 78 (h) 120 Practice time 4A 1 1 1 1
2 × 39 2 × 60 1. Unit fractions: ,, ,
8 5 10 14
3 × 13 2 × 30 2. Like Fractions Unlike Fractions
2 × 15 2 7 5 1 3
,
,,
3 × 5 (a) 5 5 4 8 7
4. (a) 3 × 3 × 3 (b) 2 × 2 × 2 × 2 × 3 (c) 2 × 3 × 3 × 3 (b) 3 1 4 6 5
,
,,
(d) 3 × 3 × 7 (e) 2 × 3 × 13 (f) 7 × 13 4 4 5 7 9
(g) 5 × 13 (h) 2 × 2 × 2 × 2 × 2 × 3 (i) 2 × 2 × 2 4 2 4 3 7
,,
,
(j) 2 × 2 × 2 × 2 × 7 (k) 5 × 5 × 5 (c) 7 7 9 5 8
(l) 2 × 2 × 2 × 2 × 3 × 3
think tank (Page 66) 3. (a), (c), (d) 4. (b), (c), (d)
HCF 5. (a) 19 ( b) 13 (c) 35 ( d) 52 ( e) 111
3
Practice time 3e 8 1 3 11 4 7 1 8 1
1. (a) 1, 2, 3, 6 (b) 1, 3 (c) 1, 2, 4, 8 (d) 1, 2, 3, 6 6. (a) 4 4 ( b) 4 4 (c) 5 5 ( d) 3 4 ( e) 5 3
2. (a) 5 (b) 6 (c) 11 (d) 7 (e) 2 (f) 10 2 3 4 5 6 2 3 4 5 6 4 6 8 10 12
,
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,
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,
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(g) 2 (h) 8 (i) 15 (j) 14 (k) 25 (l) 7 7. (a) 10 15 20 25 30 ( b) , , , , (c) 14 21 28 35 42
8 12 16 20 24
3. (a) 3 (b) 18 (c) 8 (d) 14 (e) 5 (f) 8 16 24 32 40 48 4 6 8 10 12
,
,
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(g) 12 (h) 11 (i) 4 (j) 11 (k) 5 (l) 24 (d) 22 33 44 55 66 (e) , , , ,
4. (a) 21 (b) 7 (c) 4 (d) 18 (e) 2 (f) 5 10 15 20 25 30
(g) 4 (h) 5 8. (a) 8, 20 (b) 8 (c) 15 (d) 28 (e) 6, 4, 2
5. 40 6. 8 cm 7. 4 litres (f) 5, 15, 1 (g) 6, 20, 5
Challenge Question (Page 70) 9. (a) 20 ( b) 25 (c) 35
44 rows 28 35 49
5
8
Practice time 3F 10. (a) 1 3 ( b) 3 4 ( c) 4 5 ( d) 4 5 ( e) 17 (f) 13
1. (a) 60 , 120, 180 (b) 48 , 96, 144 (c) 42 , 84, 126 2 4 1 5
(g) ( h) ( i) ( j)
(d) 90 , 180, 270 (e) 30 , 60, 90 5 5 3 12
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