Page 183 - Revised Maths Wisdom Class - 6

Answers 181

5. 4, 6, 8, 9, Product = 1728; 1728 = 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 3 6. (a) Divisible by 2 (b) not divisible by 2, 3 and 6
(c) Divisible by 2, 3 and 6 (d) Divisible by 2, 3, and 6 7. (a) Divisible by 4 and 8 (b) Divisible by 3, 4 and 8
(c) Divisible by 3 and 9 (d) Divisible by 4 and 8 8. (a) Not divisible by 5 and 10 (b) Divisible by 5 only (c) Divisible by 5 and 10 both
(d) Divisible by 5 only 9. (a) divisible by 11 (b) not divisible by 11 (c) not divisible by 11
10. (a) 0 (b) 2 (c) 2 (d) 5 11. 1, 2, 3, 6, 9 12. (b) and (c) 13. Many answers are possible.
14. (a) Smallest digit = 0, greatest digit = 9 (b) Smallest digit = 0, greatest digit = 0
15. 4 and 6 both are divisible by 2; Their sum = 10 which is divisible by 2.

REVIEW TIME

A. 1. 60 = 29 + 31 2. 2 and 3 3. No 4. False 5. (3, 5) 6. 1 7. (3, 5, 7) 8. No 9. A number is divisible by 8, if the
number formed by the last three digits is divisible by 8. B. 1. (b) 2. (c) 3. (b) 4. (c) 5. (c) 6. (a) 7. (a) 8. (d) 9. (b)
C. 1. Prime 2. 23,29 3. 9 4. Even D. 1. F 2. F 3. T 4. F 5. F E. 1. (a) 2. (b) 3. (c) 4. (a)
F. 1. (b) 2. (c) 3. (a) G. 1. (a) 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 (b) 1, 5, 17, 85 (c) 1, 2, 3, 4, 8, 12, 24, 32, 48, 96
(d) 1, 5, 7, 25, 35, 175 2. 75, 78, 81, 84, 87, 90 3. Smallest even prime number = 2, Smallest odd composite number = 9
4. (a) No (b) No (c) No (d) No 5. (a) 3 + 29 + 31 = 63 (b) 5 + 43 + 47 = 95 (c) 7 + 23 + 19 = 49
6. 1512 = 2 × 2 × 2 × 3 × 3 × 3 × 7 7. (a) 12, 24, 36 (b) 12, 24, 36 8. yes 9. (b) and (c) 10. (a) 2121 = 3 × 7 × 101
(b) 1197 = 3 × 3 × 7 × 19 (c) 20570 = 2 × 5 × 11 × 11 × 17

Chapter-4 : Number Play

Exercise - 4A
1. Do it yourself 2. Do it yourself 3. 517, 115, 120, 998 4. (a) 7894, 7895, 7896, 7898, 7900, 7901, 7902
(b) 6335, 6345, 6355, 6365, 6385, 6395, 6405 (c) 2620, 2625, 2630, 2635, 2640, 2645, 2650
(d) 2314, 2318, 2320, 2324, 2326, 2326, 2328 (e) 9077, 9080, 9083, 9086, 9089, 9095
Exercise - 4B
1. 98000 2. 10007 3. 97 4. 148 5. 9910 6. (a) 1000 (b) 1,00,000 (c) 8,00,000 (d) 1,40,00,000 (e) 90,000 (f) 60,000

REVIEW TIME
A. 1. Do it yourself 2. 1001 3. 6174 4. 4 5. 2
B. 1. c 2. a 3. c 4. a 5. c C. 1. Palindromes numbers 2. 6174 3. 29
D. 1. T 2. F 3. F 4. T E. 1. a 2. b 3. c 4. c
F. 1. (a) 2. (c) G. 1. 7500, 9870, 8632, 6034 2. 16200, 29765, 19381, 38408 3. 50556, 396406
4. (a) 17, 52, 10, 16, 1 (b) 32, 2, 1
Chapter-5 : Fractions

Exercise – 5A
2 3 2 3 2 5
1. (a) (b) (c) (d) (e) (f)
3 7 9 5 5 12

2. (a) = 7 (b) = 11 (c) = 5 (d) = 4
12 16 6 9

3. (a) 3 (b) 3 (c) 5 (d) 5 (e) 3 4. 2 bananas 5. 3 6. 3 7. ` 21 8. 2 , 16 9. 6 or 2 10. 1
7 5 8 24 10 4 7 5 9 3 6
Exercise – 5B
P Q
1. (a) (b)
0 1 2 3 4 5 6 1 0 1 2 3 4 5 6 7 8 1
7 7 7 7 7 7 9 9 9 9 9 9 9 9
P represents 3 . Q represents 4 .
7 9
R
(c)
1 2 3 4 5 6 7 8 9 10 12 13 R represents 13 .
0 11 11 11 11 11 11 11 11 11 11 1 11 11 11