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Subjects>Math>Basic Math

Greatest common factor of 45 and 20?

Updated: 4/28/2022

Wiki User

∙ 12y ago

Best Answer

The greatest common factor (GCF) of 45 and 20 is 5.

Prime factors:

45 = 5Ã—3Ã—3

20 = 5Ã—2Ã—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.

Wiki User

∙ 12y ago

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