Question 1 [1 mark]
30
Mark scheme
- A [1] — cao 30
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30
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240
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1, 2, 4, 5, 10, 20
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5
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60
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360
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7, 14, 21
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12
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6
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20
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2² × 3 × 5
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2³ × 3² × 5²
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30
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8
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15
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7
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36
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60
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90
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360
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18
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72
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7350
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2² × 3 × 7
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12
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84
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HCF = 0.6, LCM = 3.6
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45 and 63
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77
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HCF(a,b) × LCM(a,b) = a × b
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