1.
a. False b. True c. False d. True e. True f. False
2. (a) {5, 10, 15, 20} (b) {15, 30, 45, 60} (c) {3, 6, 9, 12} (d) {20, 40, 60, 80}
3. (a) {1, 2, 3, 4, 6, 8, 12, 24} (b) {1, 2, 3, 6, 9, 18} (c) {1, 2, 3, 4, 6, 9, 12, 18, 36} (d) {1, 2, 11, 22}
4. (a) 10 (b) 60 5. (a) 2 x 2 x 2or 23 (b) 2 x 2 x 3 or 22 x 3 (c) 2 x 2 x 2 x 3 or 23 x 3
6.
(a) 4
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(b) 1.2
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(c) 30
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(d) 36
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(e) 5.29
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(f) 0.16
|
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7.
(a) 0.5 or 1/2
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(b) 5
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(c) 0.067 (2 s.f.) or 1/15
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(d) 1.25 or 5/4
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(e) 0.29 (2 s.f.) or 2/7
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(f) 0.005 or 1/200
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8. (a) 0.125 (b) 0.4 (c) 0.004
9.
(a) 8.32 × 101
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(b) 3.2 × 10 -1
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(c) 5.417 × 102
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(d) 9.63 × 10 - 3
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(e) 8.5 × 100
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(f) 3.21 × 104
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10. (a) 512 (b) 0.00361 (c) 80 000
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