# Find the GCF 40 , 20 , 4 40 , 20 , 4
Find the common factors for the numerical part:
40,20,4
The factors for 40 are 1,2,4,5,8,10,20,40.
The factors for 40 are all numbers between 1 and 40, which divide 40 evenly.
Check numbers between 1 and 40
Find the factor pairs of 40 where x⋅y=40.
xy14022041058
List the factors for 40.
1,2,4,5,8,10,20,40
1,2,4,5,8,10,20,40
The factors for 20 are 1,2,4,5,10,20.
The factors for 20 are all numbers between 1 and 20, which divide 20 evenly.
Check numbers between 1 and 20
Find the factor pairs of 20 where x⋅y=20.
xy12021045
List the factors for 20.
1,2,4,5,10,20
1,2,4,5,10,20
The factors for 4 are 1,2,4.
The factors for 4 are all numbers between 1 and 4, which divide 4 evenly.
Check numbers between 1 and 4
Find the factor pairs of 4 where x⋅y=4.
xy1422
List the factors for 4.
1,2,4
1,2,4
List all the factors for 40,20,4 to find the common factors.
40: 1,2,4,5,8,10,20,40
20: 1,2,4,5,10,20
4: 1,2,4
The common factors for 40,20,4 are 1,2,4.
1,2,4
The GCF (HCF) of the numerical factors 1,2,4 is 4.
4
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