Page 181 - Revised Maths Wisdom Class - 6

ANS WERS

Chapter-1 : Patterns in Mathematics

Exercise – 1A

1. (a) 21, 34, 55 Rule: Add the two previous numbers (b) 36, 41, 39 Rule: Add 5, subtract 2
(c) 101, 99, 94 Rule: Subtract 2, then 5 (d) 324, 972, 2916 Rule: Multiply by 3 to get the next term
2. (a) 1 + 2 + 3 + 4 + 5 = 15 1 + 2 + 3 + 4 + 5 + 6 = 21 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28
(b) 444 ÷ 12 = 37 555 ÷ 15 = 37 666 ÷ 18 = 37
3. (a) 2 (b) 11 (c) 11
4. (a) (b) (c) (d) 24
28 48 72
12 16 20 28 6 12 4 6
5 7 9 8 12 16 2 3 4 2 2 3
2 3 4 5 3 5 7 9 1 2 1 3
1 2 3 4 5

5. (a) (iv), (b) (iii), (c) (iii),

6. (a) 25; 1 + 3 + 5 + 7 + 9 + 11 = 36 (b) 91, 105, 120 (c) 100, 121, 144
7. 81, 100, 121, 144, 149, 196 8. 42 × 42 = 1764; 44 × 44 = 1936

REVIEW TIME
A. 1. Number ÷ 2 2. Number ÷ 2 3. 6 zero 4. 15 5. fi bonacci series : 0,1,1,2,3,5,8,13,21,24...
6. Sides are equal length 7. 8 B. 1. b 2. a 3. d 4. c 5. b C. 1. 20 2. 30 3. 36 4. 26 5. 125
D. 1. True 2. False 3. True 4. True 5. False E. 1. (b) 2. (a) 3. (b) 4. (c)
F. 1. (a) 2. (a) G. 1. 89, 144 2. 289 3. 63 4. 7,19,37... 5. 14 6. (a) I-3, II-9, III-18 (b) , 30

Chapter-2 : The Other Side of Zero

Exercise – 2A
1. (a) –18 (b) 3 (c) 6 (d) – 200
2. (a) 90 m above sea level (b) Deposit of ` 5500 in bank (c) A fall of temperature by 7°C (d) Spending ` 1500
(e) Moving 8 km to South 3. – 8, – 7, – 6, – 5, – 4, – 3, – 2, – 1, 0, 1, 2, 3, 4, greatest = 4, smallest = – 8
4. (a) 3 (b) – 9 (c) – 9 (d) 2 5. (a) 13 (b) 0 (c) 8 (d) 101
6. (a) 15, 10, 7, 1, – 2, – 3, – 20 (b) 4, 3, 0 – 206, – 208, – 209 7. (a) –11, – 4, – 3, 0, 4, 7 (b) – 900, – 100, – 90, 9, 10, 1000
8. – 9, – 8, – 7, – 6 9. (a) – 3, 0, 3 (b) 15, 19, 23
10. (a) Delhi: +24° C, Manali:– 7° C, Jaipur: 30° C, Srinagar: –4° C, Ladakh:–14 °C (b) Ladakh (c) Delhi and Jaipur
Exercise – 2B
1. (a) 10 (b) – 1 (c) – 8 2. (a) 8 (b) – 34 (c) 45 (d) – 1144 (e) – 814 (f) – 42
3. (a) 7659 (b) 194 (c) – 11814 (d) – 1633 4. (a) – 98 (b) – 150 (c) 1567 (d) – 190
5. (a) < (b) > (c) < (d) > (e) < 6. 1983 7. ` 6000 8. (a) – 69 (b) 0 (c) 138 (d) – 1
9. (a) Successor = 1, Predecessor = – 1 (b) Successor = – 8, Predecessor = – 10 (c) Successor = 1002, Predecessor = 1000
(d) Successor = – 188, Predecessor = – 190 10. (a) – 11 (b) 3 11. 565 m below or –565 m
Exercise – 2C

1. (a) – 3 (b) 11 (c) 15 2. (a) 26 (b) – 200 (c) 1999 (d) 121
(e) – 180 (f) 4150 (g) – 199 (h) 1000 3. No 4. 26°C 5. 7582
6. 1506 7. – 3901 8. (a) – 981 (b) – 198 9. 7° 10. 7940 m above sea level.