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The HCF of 4 and 90 is 2.
The GCF is 14.
The HCF of 70 is 70. But it's a factor as opposed to a common factor because there's only one number.
Factors of 24: 1,2,3,4,6,8,12 and 24. Factors of 90: 1,2,3,5,9,10,18,30,45 and 90. The HCF (highest common factor) is 3.
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