Find GCF of 24 and 21

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To find the GCF of several numbers the first thing you have to do is decompose the numbers, so:

24 | 2

12 | 2

6 | 2

3 | 3

1

24 = 2 x 2 x 2 x3

24 = 2³ x 3

21 | 3

7 | 7

1

21 = 7 x 3

GCF = common factors with the lowest exponents

GCF = 3

The greatest common factor of 24 and 21 is 3

3x8=24 and 3x7=21