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What Is The Gcf Of 28,77?

3 Answers

Anonymous Profile
Anonymous answered
First find the factors of each number

Factors of 28: 1,2,4,7, 14, 28

Factors of 77: 1, 7, 11, (you can go further, but there is no point as you have reached the highest COMMON factor)

What is the highest factor COMMON to both - answer - 7

I hope this helps
Anonymous Profile
Anonymous answered
Factors of 28: 1, 2, 4, 7, 14, 28

Factors of 77: 1, 7, 11, 77

Greatest common factor: 7
Mark Mottian Profile
Mark Mottian answered
Euclidean algorithm:

77 / 28 = (28 * 2) + 21

28 / 21 = (21 * 1) + 7

21 / 7 = (7 * 3) + 0

Since the last remainder is zero, the algorithm ends with 7 as the greatest common divisor of 28 and 77.

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