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The greatest common factor (GCF) of 45 and 20 is 5.
Prime factors:
45 = 5×3×3
20 = 5×2×2
the only prime factor in both is 5, and so the highest common factor is 5.
Alternative method:
45 mod 20 = 5
20 mod 5 = 0
so HCF = 5.
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∙ 11y ago
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