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Factors of 18 are 3,3,& 2.
Factors of 21 are 3 & 7
One lot of '3' is common to both so '3' is the HCF.
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Earn +20 ptsQ: What is the highest common factor of 18 and 21?
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Continue Learning about Other Math
Which number goes into 21 and 18?
The highest common factor of 21 and 18 is 3
What is the highest common factor of 28 and 21?
it is 7
What is the highest common factor of 21 and 105?
Since 21 is a factor of 105, it is automatically the GCF.
What is the highest common factor of 21 and 41?
The GCF is 1.
What are the GCF 63 and 84?
63 and 84's highest common factor is 21.
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