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haneylia
You need to find the biggest number that is a factor of both 8 and 20. Factor's are whole numbers that can be multiplied by other whole numbers to get that number.

Factors of 8

1, 2, 4, 8

Factors of 20

1, 2, 4, 5, 10, 20

The greatest common factor is 4
abbigabi12
the greatest common factor is 4