Find the GCF -21 , 18

Math
-21 , 18
Find the common factors for the numerical part:
-21,18
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 18 are 1,2,3,6,9,18.
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The factors for 18 are all numbers between 1 and 18, which divide 18 evenly.
Check numbers between 1 and 18
Find the factor pairs of 18 where x⋅y=18.
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List the factors for 18.
1,2,3,6,9,18
1,2,3,6,9,18
List all the factors for -21,18 to find the common factors.
-21: -21,-7,-3,-1,1,3,7,21
18: 1,2,3,6,9,18
The common factors for -21,18 are 1,3.
1,3
The GCF (HCF) of the numerical factors 1,3 is 3.
3
Find the GCF -21 , 18

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