Cambridge Essentials Mathematics Support 9 N1.1 Answers

/ N1.1 Answers

1 b 103 = 10 ´ 10 ´ 10 = 1000

c 106 = 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 = 1 000 000

d 100 = 1

e 108 = 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 = 100 000 000

f 1010 = 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 ´ 10 = 10 000 000 000

2 a 103 b 104 c 102 d 105 e 100

3 a 3 ´ 102 b 9 ´ 102 c 7 ´ 103 d 5 ´ 104 e 2 ´ 106 f 4 ´ 105

g 8 ´ 105 h 6 ´ 107

4 a 5000 b 300 c 40 000 d 70 e 9000 f 6

g 20 h 1500 i 2800 j 41 000 k 231 l 760 000

5 a 2400 b 53 000 c 21 500 d 47 000 e 28 f 157.06

g 4.3 h 720 100 i 640 j 50 k 3600 l 900

6 a 6.8 b 0.052 c 0.07 d 0.46 e 0.063 f 0.125

g 0.037 h 0.0051 i 0.0004 j 0.00084 k 0.00008 l 0.000104

7 a 10 b 4.4 c 100 d 1.2 e 100 f 45

g 100 h 140 i 10 000

8 a 16 weeks b 22 more weeks

9 a 750 g b 0.75 kg

10 C 3.4 ÷ 10

11 A 25.9 ÷ 100

12 a 31 ´ 0.1 = 31 ´ = 31 ÷ 10 = 3.1 b 58 ´ 0.01 = 58 ´ = 58 ÷ 100 = 0.58

c 1.4 d 0.72 e 0.4 f 0.93 g 0.15 h 0.74

i 0.124 j 0.106 k 2.56 l 0.294 m 0.502 n 21.425

13 B 7.3 ´ 10

14 D 14.6 ´ 100

15 a 23 ÷ 0.1 = 23 ÷ = 23 ´ 10 = 230 b 46 ÷ 0.01 = 46 ÷ = 46 ´ 100 = 4600

c 180 d 4300 e 70 f 2600 g 36 h 82

i 3150 j 7040 k 2036 l 3 m 80 n 2.5

16 a 57 × 0.1 = 5.7 57 × 0.01 = 0.57 57 ÷ 0.1 = 570 57 ÷ 0.01 = 5700

b 0.34 × 0.1 = 0.034 0.34 × 0.01 = 0.0034 0.34 ÷ 0.1 = 3.4 0.34 ÷ 0.01 = 34

17 a 0.4 litres b 1.5 litres c 25 glasses

18 a 4.2, 4.9, 5.3, 5.6 b 5.4, 5.7, 6.7, 7.8 c 4.5, 4.7, 5.6, 6.4, 6.5, 7.4

19 a 5.12, 5.32, 5.33, 5.41 b 5.43, 5.44, 5.45, 5.47 c 5.39, 5.4, 5.49, 5.5

20 a 5.1 b 7.7 c 5.4 d 5.45

21 a 2.3 b 15.3 c 23.69 d 20.43 e 0.64

f 50.233 g 15.226 h 2.981 i 0.3256 j 2.9742

22 a 2.11, 2.15, 2.18, 2.2 b 0.15, 0.19, 0.21, 0.25, 0.3 c 5.235, 5.24, 5.302, 5.325, 5.33

d 15.0345, 15.045, 15.099, 15.135 e 0.0011, 0.0067, 0.0092, 0.01, 0.0103

23 a 6.7 < 7.6 b 9.05 > 9.04 c 23.45 < 23.54

d 16.53 > 16.5 e 13.532 < 13.542 f 0.956 < 0.965

g 1.0084 > 1.0078 h 8.8 > 8.08 i 4.17 > 4.126

24 a 5.8 < 8.58 b 12.33 < 12.3651 c 0.768 < 0.775 d 1.0049 < 1.0052

25 a 0.59 > 0.54 b 7.08 > 7.008 c 560.87 > 560.807 d 24.3255 > 24.2355

26 7.8351 g 7.3871 g 7.38 g 7.0835 g

27 7.33 m 7.325 m 7.30 m 7.24 m 7.235 m

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