Respuesta :

Answer:

4

Step-by-step explanation:

We can find the greatest common factor by listing the factors of both numbers.

Factors of 12 : 1, 2, 3, 4, 6, 12

Factors of 20 : 1, 2, 4, 5, 10, 20

The common factors are : 1, 2, 4

The greatest common factor is 4

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