Find the GCF 21 , 8

Math
21 , 8
Find the common factors for the numerical part:
21,8
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 8 are 1,2,4,8.
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The factors for 8 are all numbers between 1 and 8, which divide 8 evenly.
Check numbers between 1 and 8
Find the factor pairs of 8 where x⋅y=8.
xy1824
List the factors for 8.
1,2,4,8
1,2,4,8
List all the factors for 21,8 to find the common factors.
21: 1,3,7,21
8: 1,2,4,8
The common factors for 21,8 are 1.
1
The GCF (HCF) of the numerical factors 1 is 1.
1
Find the GCF 21 , 8

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