Find the GCF 15 , 18

Math
15 , 18
Find the common factors for the numerical part:
15,18
The factors for 15 are 1,3,5,15.
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The factors for 15 are all numbers between 1 and 15, which divide 15 evenly.
Check numbers between 1 and 15
Find the factor pairs of 15 where x⋅y=15.
xy11535
List the factors for 15.
1,3,5,15
1,3,5,15
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.
xy1182936
List the factors for 18.
1,2,3,6,9,18
1,2,3,6,9,18
List all the factors for 15,18 to find the common factors.
15: 1,3,5,15
18: 1,2,3,6,9,18
The common factors for 15,18 are 1,3.
1,3
The GCF (HCF) of the numerical factors 1,3 is 3.
3
Find the GCF 15 , 18

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