Find the GCF -21 , 4

Math
-21 , 4
Find the common factors for the numerical part:
-21,4
The factors for -21 are -21,-7,-3,-1,1,3,7,21.
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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.

List the factors for -21.
-21,-7,-3,-1,1,3,7,21
-21,-7,-3,-1,1,3,7,21
The factors for 4 are 1,2,4.
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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 -21,4 to find the common factors.
-21: -21,-7,-3,-1,1,3,7,21
4: 1,2,4
The common factors for -21,4 are 1.
1
The GCF (HCF) of the numerical factors 1 is 1.
1
Find the GCF -21 , 4

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