a) 4 = 2²
5 = 5 • 1
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cmmmc = 5 • 4 = 20
b) 7 = 7 • 1
2 = 2 • 1
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cmmmc = 7 • 2 = 14
c) 10 = 2 • 5
15 = 5 • 3
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cmmmc = 5 • 3 • 2 = 5 • 6 = 30
d) 32 = 2^5
24 = 2³• 3
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cmmmc = 2^5 • 3 = 32 • 3 = 96