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The factors of 105 are 3,5, & 7.

The factors of 63 are 3,3, & 7.

One lot of '3' and one lot of '7' is common to both numbers.

Hence 3 x 7 = 21 , which is the HCF of 105,& 63.

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lenpollock

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1y ago

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Wiki User

11y ago

The GCF is 21.

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Wiki User

15y ago

21.

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Q: What is the highest common factor of 105 and 63?
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