Page 252 - Math Genius C4

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

2. (a) 34, 68, 102, 136, 170 (b) 26, 52, 78, 104, 130 Chapter 6. Fractions
(c) 30, 60, 90, 120, 150 (d) 50, 100, 150, 200, 250 Let’s ReCaLL
3. (a) 40 (b) 72 1. (a)
(c) 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132 3 4 3 4
(d) 21, 24, 27, 30, 33, 36, 39, 42, 45, 48 2. (a) 9 (b) 9 (c) 9 (d) 9
(e) 54, 63, 72, 81, 90, 99 (f) 72 3. (a) Num = 2, Den = 5 (b) Num = 3, Den = 7 (c) Num = 4, Den = 9
4. (a) 20 , 40, 60 and 80 (b) 15 , 30, 45 and 60 (d) Num = 5, Den = 10
4. (a) 5 apples (b) 14 pencils (c) 15 stamps
(c) 14 , 28, 42 and 56 (d) 24 , 48, 72 and 96
Practice time 6a
(e) 20 , 40, 60 and 80
1. (a), (b), (e) 2. (a), (c), (d), (e)
Practice time 5C
3. (a) 6 (b) 6 (c) 4 (d) 1
1. (a) True (b) False (c) True (d) True 4. (a) 9 (b) 18 (c) 7 (d) 9
2. Divisible by 5. (a) 8 (b) 54 (c) 45 (d) 42
Numbers 2 3 4 5 9 10
(a) 62 yes no no no no no 6. (a) 10 15 20 25 30 (b) 6 9 12 15 18
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(b) 96 yes yes yes no no no 14 21 28 35 42 8 12 16 20 24
(c) 284 yes no yes no no no (c) 10 15 20 25 30 (d) 4 6 8 10 12
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(d) 251 no no no no no no 16 24 32 40 48 14 21 28 35 42
(e) 1024 yes no yes no no no (e) 16 24 32 40 48
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(f) 6318 yes yes no no yes no 6 9 12 15 18
think tank (Page 99) 7. (a) yes (b) no (c) yes (d) no (e) yes
1. 2, 3, 5, 7, 11, 13, 17, 19, and 23. think tank (Page 111)
2. 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27 and 28. 1. False 2. False
Practice time 6B
Practice time 5D
1. Prime number: (c); Composite numbers: (a), (b), (d), (e), (f) 1. (a) no (b) yes (c) no (d) yes (e) yes (f) no
2. (a) 11, 13, 17, 19, 23 and 29 (b) 53 and 59 (c) 83 and 89 (g) no (h) yes (i) no (j) yes
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3. (a) 4 (b) 7 (c) 6 2. (a) 14 7 = 2 (b) 10 ÷ 2 = 5 (c) 15 5 = 3
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4. (a) 10, 5 (b) 7, 3 × 3 (c) 2 × 50, 25 × 2, 5 × 5 21 ÷ 7 3 18 2 9 35÷ 5 7
5. (a) (b) (c) 1 1 1 1 2 3
3 75 2 108 5 625 3. (a) 2 (b) 2 (c) 5 (d) 3 (e) 3 (f) 4
5 25 2 54 5 125 (g) 2 (h) 5 (i) 11 (j) 15
3 7 13 19
5 3 27 5 25
Practice time 6C
3 9 5 1. (a),(b), (d), (e) 2. (b), (e) 3. (b), (d), (f)
3 4. (a) 1 4 (b) 1 5 (c) 1 4 (d) 2 6 or 2 1 (e) 1 7
5 7 15 12 2 13
6. (a) 2 × 3 × 3 (b) 2 × 2 × 5 (c) 2 × 2 × 2 × 2 × 2 4
(d) 2 × 3 × 7 (e) 2 × 2 × 3 × 5 (f) 3 × 3 × 3 × 3 (f) 4 5
Challenge Question (Page 102) 17 22 32 17 26 64
5. (a) (b) (c) (d) (e) (f)
1. 2412 2. 8 2 3 3 4 5 7
6. (a) 18 (b) 7 (c) 2 (d) 29
Chapter assessment
Practice time 6D
1. (a) (iii) (b) (ii) (c) (iii) (d) (i)
2. (a) F (b) F (c) F (d) T 1. (a) > (b) < (c) > (d) < (e) < (f) <
(e) F (f) T (g) > (h) < (i) < (j) >
3. (a) 30 (b) 10 (c) 60 (d) 20 (e) 33 2. (a) 4 (b) 9 (c) 8 (d) 3 (e) 8
4. (a) 26 (b) 99 (c) 99999 (d) 99999 5 13 2 4 11
5
5 6
2
5. 1, 2, 4, 5, 8, 10, 25, 40, 125 6. 6th 3. (a) 2 < 4 < < 7 (b) 1 <<<
7. 4 pairs (13 and 31; 17 and 71; 37 and 73; 79 and 97) 8 8 8 8 9 9 9 9
1 1 1
6
8. 312, 402, 444 and 612 (c) 6 < 6 < < 6 (d) 1 << <
Life skills (Page 104) 13 12 8 7 9 7 3 2
2
7
3
1. 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195 4. (a) 7 >> 7 > 7 (b) 4 >>> 1
2. 6, 12, 18, 24, 30 September 8 9 12 13 9 9 9 9
Mental Maths (Page 105) 9 5 3 1 4 4 4 4
(c) > > > (d) > > >
1. (a) 2. (c) 3. (c) 4. (a) 12 12 12 12 5 7 10 11
250 Mathematics-4