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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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12y ago

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