Find the GCF 21 , 28

Math
21 , 28
Find the common factors for the numerical part:
21,28
The factors for 21 are 1,3,7,21.
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The factors for 21 are all numbers between 1 and 21, which divide 21 evenly.
Check numbers between 1 and 21
Find the factor pairs of 21 where x⋅y=21.
xy12137
List the factors for 21.
1,3,7,21
1,3,7,21
The factors for 28 are 1,2,4,7,14,28.
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The factors for 28 are all numbers between 1 and 28, which divide 28 evenly.
Check numbers between 1 and 28
Find the factor pairs of 28 where x⋅y=28.
xy12821447
List the factors for 28.
1,2,4,7,14,28
1,2,4,7,14,28
List all the factors for 21,28 to find the common factors.
21: 1,3,7,21
28: 1,2,4,7,14,28
The common factors for 21,28 are 1,7.
1,7
The GCF (HCF) of the numerical factors 1,7 is 7.
7
Find the GCF 21 , 28

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