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\ 06-Jan-2025 Surender Singh Routhan Proof-2 Reader’s Sign _______________________ Date __________

Practice Time 5C 8. (a) 3 (b) 4 t(c) 3 (d) 7
1. (a) 75 (b) 84 (c) 51 (d) 32 9. (a) 5 (b) 2 (c) 2 (d) 4
2. (a) 3, 48 (b) 7, 105 (c) 3, 78 (d) 2, 80 10. (a) 18961 (b) 30301
3. (a) 11, 6 (b) 5, 23 (c) 5, 36 (d) 6, 38 Practice Time 6B
4. Sidelength = 84 m 1. (a) 14 (b) –19 (c) 51
Quick Check 2. (a) 45 (b) 73 (c) 84
9801 3. (a) 6 (b) 9 (c) 12
Practice Time 5D 4. (a) 60, cube root 60 (b) 7, cube root 35
1. (a) 98 (b) 85 (c) 207 (d) 309 5. (a) 9, cube root 7 (b) 5, cube root 15
2. (a) 69, 41 (b) 61, 42 (c) 12, 80 (d) 75, 625 9 5
3. (a) 39, 21 (b) 36, 45 (c) 114, 58 (d) 102, 99 6. (a) 10 (b) 8 (c) 72 (d) 234
4. 100489, 998001 5. 99856, 316 −11 5
Quick Check 7. (a) –72 (b) (c) (d) 1.5
1. 5.48 2. 2.12 16 7
5
Practice Time 5E 8. 3.2 metres 9. 4 6 metres 10. 14, 28, and 42
1. (a) 6 (b) 15 (c) 3 5 (d) 1 1 Brain Sizzlers
9 18 6 2 1. 64 2. 4096
2. 225, 24.75 Mental Maths
3. (a) 7.2 (b) 0.77 (c) 18.2 (d) 0.025 1. 1, 8, 27, 64, 125 2. No 3. 2 4. 3
4. (a) 0.54 (b) 0.5 5. (a) 36.8 (b) 1376 3
6. 3.465 5. 0.001 6. 6 7. 0.7 8. 1331 cm
7. (a) 14.14 (b) 18.522 (c) 20.124 (d) 0.289 9. odd 10. (a) 16651 (b) 36631
8. (a) Chapter Assessment
Mental Maths A. 1. (a) 2. (c) 3. (c) 4. (b) 5. (b)
6.
(c)
1. 21 2. 80 3. 8, 15, 17 (answer may vary) B. 1. (b) 7. (b) 8. (b) 9. (d)
2. (a)
4. 5 5. 14 cm
3 C. 1. three 2. cube root 3. even 4. 4 5. 11
Brain Sizzlers D. 1. False 2. False 3. True 4. True 5. False 17
1. 4 2. 2.22 27
Chapter Assessment E. 1. (a) 4913 6 3 (b) 9261 (c) 1030301 (d) 1331
A. 1. (a) 2. (a) 3. (a) 4. (d) 5. (c) (e) –27a b
B. 1. (d) 2. (a) 3. (b) 4. (a) 2. (a) 24 (b) 72 3. (a) 1 (b) 5
C. 1. even 2. perfect square 3. 14 4. n 2 4. No, 68
2
2
5. m + 1, m – 1 5. 1 6. (a) −15 (b) 31 (c) −7 7. 7
D. 1. True 2. False 3. True 4. True 5. True 19 50 10
E. 1. (a) 441 (b) 1089 (c) 1.96 (d) 0.25 8. (a) 15 (b) 9 (c) 45 (d) `11,250
2. 96 each 3. 24 4. 13 m 5. 101 6. 144
8. (a) 10.5 m (b) 13.25 m (c) 135.8125 m 2 (d) 121 Unit Test – 2
Chapter 6: Cubes and Cube Roots A. 1. (a) 2. (c) 3. (c) 4. (c) 5. (d)
6. (d) 7. (a) 8. (b) 9. (d) 10. (a)
Let’s Recall B. 1. width/size 2. 2 3. 0 4. 7 5. 20047
1. 1 + 7 + 19 + 37 = 64, 1 + 7 + 19 + 37 + 61 = 125 C. 1. True 2. True 3. False 4. False 5. True
2. 216, 343, 512 3. (a) 64 (b) 1000 (c) 1 D. 1. (a) 25–30 (b) 35–40 2. 2 3. (a) 19 (b) 27
Think and Answer 125 4. 12, 35, 37 5. 1024, 9801 3 6. 65.5 7. 17 m
64 8. No, 36
Quick Check
No Chapter 7: Comparing Quantities
Quick Check
No Let’s Recall
Think and Answer 1. (a) 1 : 5 (b) 25%
(c) No, because profit would be 25%.
1. 5 2. 2 2. 125 g for `180
Think and Answer Quick Check
1. 10 1. (a) 5 bulbs (b) 100 L 2. 200
Practice Time 6A 3. Selling price of the property is `12,50,000
1. (a) 2197 (b) 287496 (c) –3375 (d) 195.112 Practice Time 7A
(e) –1030.301 (f) 27 (g) − 125 1. 600 2. 2% 3. 85%
2744 1331 4. `50,400; `75,000 5. 33.33% 6. 300
2. (a), (c), (d), (f), (g) 7. Female experts = 100 8. 4% decrease 9. `448
3. (a), (c), (d), (g) 10. `62,400 11. `2,00,000 12. 40.2 kg
4. (a), (c), (e), (f), (g) Think and Answer
5. (i) 2 × 2 × 2 = 8, an even number
1
(ii) 4 × 4 × 4 = 64, an even number (Answers may vary) 1. Vijay calculation is incorrect. 2. 33 %
6. (i) 3 × 3 × 3 = 27, an odd number 3
(ii) 5 × 5 × 5 = 125, an odd number (Answers may vary) Quick Check
7. (c) Yes, 13 (d) Yes, 18 (e) Yes, 20 (f) Yes, 22 First machine: `4140, Second machine: `5175, Profit: `315

365 Answers