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Self Practice 2.1d 4. 48 Self Practice 3.1g
5. 27
1. (a) 24 (b) 18 1. (a) 92 cm to 110 cm
(c) 12 (d) 6 6. These two numbers do not have (b) Enough. It is because the
(e) 18 (f) 6 common factors except 1. For maximum length of the white
(g) 4 (h) 3 instance, 2 and 3. lace needed is 4.4 m
7. 6 and 60
Self Practice 2.1e
8. 5:15 p.m. Mastery 3.1
1. 6 boxes
9. 30 cm × 30 cm
2. 15 plates 1. (a) No
10. The second Saturday (b) No
Mastery 2.1 11. (a) 6 pages (c) Yes
(b) 4 photographs and
1. 15 1024: 2 × 2 × 2 × 2 × 2
7 newspaper cuttings.
2. 1 968 = 2 × 2 × 2 × 2 × 3 × 41 × 2 × 2 × 2 × 2 × 2
4 968 = 2 × 2 × 2 × 3 × 3 × 3 × 23 Chapter 3 Squares, Square
HCF = 24 Roots, Cubes and 2. 100 = 2 × 5 × 2 × 5
100 = 10
3. 4, 8, 16, 20, 28, 32 Cube Roots 
4. 2 segments 3. 6 10 14 19 22
5. 20 cm Self Practice 3.1a
4
Self Practice 2.2a 1. (a) No (b) Yes 4. (a) 36 (b) 49
(c) No (d) Yes 169
1. (a) Yes (b) No (c) 9 (d) 65.61
(c) Yes (d) Yes Self Practice 3.1b (e) 19 (f) 3
(e) Yes (f) Yes  8 7
1. (a) 5 × 5 = 5 (g) (h) 1.1
2. (a) 10, 20, 30, 40, 50  5
(b) 15, 30, 45, 60, 75 (b) 8 × 8 = 8 5. (a) 16 129 (b) 1 197.16
(c) 198, 396, 594, 792, 990 (c)  441
24 = 24
2
(d) 120, 240, 360, 480, 600 (c) 0.009409 (d) 64
(e) 24, 48, 72, 96, 120 Self Practice 3.1c (e) 8.72 (f) 10.41
(f) 120, 240, 360, 480, 600 25 (g) 0.63 (h) 1.61
(g) 120, 240, 360, 480, 600 1. (a) 64 (b) 36
(h) 180, 360, 540, 720, 900 (c) 1.96 6. Length of side of the base of the
81
2. (a) 841 (b) pyramid
Self Practice 2.2b 121
52 900
(c) 234.09 = 
1. (a) 144 (b) 30 = 230 m
(c) 24 (d) 180 Self Practice 3.1d
(e) 90 (f) 224 7. (a) 90 000 (b) 2 500
(g) 252 (h) 60 1. (a) 9 (b) 7 (c) 0.0016 (d) 64
(c) 11 (d) 30 (e) 4 (f ) 15
Self Practice 2.2c 7 2 (g) 3 (h) 0.7
(e) (f ) 2
1. 36 seconds 9 3 8. (a) 10 (b) 6, 8
2. 30 pieces (g) 5 (h) 1.5
8 Self Practice 3.2a
Mastery 2.2
Self Practice 3.1e 1. (a) 27 = 3 × 3 × 3
1. 40 1. (a) 6.56 (b) 6.15 27 is a perfect cube.
2. 72 (c) 0.68 (d) 3.58 (b) 45 = 3 × 3 × 5
3. 24 days 45 is not a perfect cube.
Self Practice 3.1f
4. 150 cm (c) 215 = 5 × 43
1. (a) 3 600 (b) 400 215 is not a perfect cube.
Let’s Practise (c) 81 (d) 0.04 (d) 343 = 7 × 7 × 7
1. 60 (e) 6 (f) 4 343 is a perfect cube.
(g) 11 (h) 0.9
2. 2
3. 60

309
Answers

14 Ans Math F1.indd 309 11/10/16 12:23 PM