Find the GCF 21 , 45

Math
21 , 45
Find the common factors for the numerical part:
21,45
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 45 are 1,3,5,9,15,45.
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The factors for 45 are all numbers between 1 and 45, which divide 45 evenly.
Check numbers between 1 and 45
Find the factor pairs of 45 where x⋅y=45.
xy14531559
List the factors for 45.
1,3,5,9,15,45
1,3,5,9,15,45
List all the factors for 21,45 to find the common factors.
21: 1,3,7,21
45: 1,3,5,9,15,45
The common factors for 21,45 are 1,3.
1,3
The GCF (HCF) of the numerical factors 1,3 is 3.
3
Find the GCF 21 , 45

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