Page 251 - Math Genius C4

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

think tank (Page 60) Challenge Question (Page 79)
1. 400 2. 4000 3. 3 4. `18000 164
Practice time 3e Practice time 4e
1. (a) 0 (b) 1 (c) 278 (d) 321 (e) 0 (f) 48 1. (a) (ii) (b) (iv) (c) (iii) (d) (i)
(g) 522 (h) 215 (i) 16 (j) 93 (k) 15 (l) 100 2. (a) 3 (b) 10 (c) 50 (d) 20
2. (a) (iv) (b) (iii) (c) (i) (d) (v) (e) (ii) (e) 50 (f) 200 (g) 100 (h) 140
Practice time 3F Practice time 4F
1. (a) 6400 (b) 2800 (c) 12000 (d) 2500 1. 59 2. 102 3. 58 4. 23
(e) 116100 (f) 174900 5. 101, No 6. 45, 57 7. 167
2. (a) 40000 (b) 210000 (c) 60000 (d) 160000 8. `28244; `30000 9. Second month, 840 10. 21, 16
(e) 420000 (f) 60000 Mental Maths (Page 82)
Practice time 3G 1. (b) 2. (a) 3. (d) 4. (c) 5. (a)
1. `6336 2. `47530 3. 28275 4. 29952 5. 82602 Chapter assessment
6. `116500 7. `510600 8. 26000 9. 40000 1. (a) (i) (b) (ii) (c) (iv) (d) (ii)
Practice time 3H 2. (a) False (b) False (c) False (d) False
1. 232 2. 744 3. 19242 4. 3870 5. 14878 6. 226616 (e) True (f) False
Mental Maths (Page 65) 3. Question Rounds to 10 actual Q and R estimated Q and R
1. (c) 2. (a) 3. (b) 4. (c) 5. (a) (a) 81 ÷ 18 80 ÷ 20 4, 9 4, 0
Challenge Question (Page 66) (b) 56 ÷ 23 60 ÷ 20 2, 10 3, 0
(c) 312 ÷ 59 310 ÷ 60 5, 17 5, 10
A = 1, B = 2, C = 3 (d) 681 ÷ 53 680 ÷ 50 12, 45 13, 30
Chapter assessment (e) 691 ÷ 51 690 ÷ 50 13, 28 13, 40
1. (a) (iii) (b) (ii) (c) (ii) (d) (iii) (e) (iii) 4. Yes, 14 5. 209 6. 522 km 7. 225 m
2. 9750 kg 3. 30535 4. `4200 5. 3780 km 9. 23 10. 220
6. 9120 7. `415840 8. ` 203850 9. 29375 Life skills (Page 84)
10. 90000 11. 112500 12. 525 13. `31350
14. (a) `1145 (b) `840 (c) `856 346, 50
(d) Since, 553 > 500, she does not have enough money to purchase this Challenge Question (Page 84)
quantity of fruits. 1. 15; 3, 10 2. (a) 1084 (b) 1480 (Answer may vary)
Chapter 4. Division Chapter 5. Factors and Multiples
Let's ReCaLL Let’s ReCaLL
1. (a) 5 (b) 8 (c) 9 2. 1 × 18 = 2 × 9 = 3 × 6 3. 1 × 20 = 2 × 10 = 4 × 5
2. (a) 75 ÷ 5 = 15, 75 ÷ 15 = 5 (b) 480 ÷ 4 = 120; 480 ÷ 120 = 4 4. 1 × 24 = 2 × 12 = 3 × 8 = 4 × 6
(c) 384 ÷ 8 = 48, 384 ÷ 48 = 8 think tank (Page 88)
3. (a) 27 (b) 8 (c) Q = 182, R = 1 4. `8 Multiplication facts: 1 × 24 = 24; 2 × 12 = 24; 3 × 8 = 24; 4 × 6 = 24
think tank (Page 72) Factors: 1, 2, 3, 4, 6, 8, 12, 24
False think tank (Page 90)
Practice time 4a 1. 90 2. 45 3. 3 4. 8
1. 153, 9, 17, 0 2. 215, 8, 26, 7 3. 1 4. 712 Challenge Question (Page 91)
5. 0 6. 0 7. 0 8. 3247 Co-prime numbers
Practice time 4B Practice time 5a
1. (a) Q = 2514; R = 1 (b) Q = 589; R = 2 (c) Q = 990; R = 2 1. (a) True (b) False (c) False (d) False
(d) Q = 559; R = 4 (e) Q = 9387; R = 0 (f) Q = 4483; R = 1 2. (a) 1, 2, 3, 4, 6 and 12. (b) 1, 2, 4, 7, 14 and 28.
(g) Q = 1826; R = 1 (h) Q = 10053; R = 6 (c) 1, 3, 5, 9, 15 and 45. (d) 1, 2, 4, 7, 8, 14, 28 and 56.
2. (a) 4 (b) 3 (c) 8
(e) 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.
Practice time 4C 3. (a) 1, 2, 3, 4, 6, 8, 12 and 24.
1. (a) Q = 281; R = 1 (b) Q = 212; R = 6 (c) Q = 541; R = 9 (b) 1, 2, 3, 4, 6, 9, 12, 18 and 36.
(d) Q = 68; R = 0 (e) Q = 94; R = 31 (f) Q = 1317; R = 3 (c) 1, 2, 3, 6, 9, 18, 27 and 54.
(g) Q = 112; R = 26 (h) Q = 387; R = 16 (d) 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.
2. (a) Q = 604; R = 8 (b) Q = 326; R = 4 (c) Q = 61; R = 54 (e) 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48 and 96.
(d) Q = 417; R = 18 (e) Q = 1806; R = 0 (f) Q = 1037; R = 9 4. (a) No (b) Yes (c) Yes (d) No
(g) Q = 776; R = 15 (h) Q = 1103; R = 22 3. (c) 867 5. (a) 1, 2, 3 and 6 (b) 1 and 5 (c) 1 and 7 (d) 1, 2, 3 and 6
Practice time 4D (e) 1, 2, 3, 5, 6, 10, 15 and 30 (f) 1, 2, 4 and 8 (g) 1 and 2
1. 7, 8 2. 42, 0 3. 9, 36 4. 279, 6 Practice time 5B
5. 23, 65 6. 237, 8 7. 5, 64 8. 2, 33 1. (a) 5, 10, 15, 20, 25, 30 (b) 7, 14, 21, 28, 35, 42
9. 13, 655 10. 23, 9 11. 99, 867 12. 101, 568 (c) 11, 22, 33, 44, 55, 66 (d) 13, 26, 39, 52, 65, 78

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