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5, because since 5 is a Prime number (meaning it has only two factors, 1 and 5) its largest factor period is itself. 1 and 5 both go into 20 evenly, so the LCF is 5.

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12y ago
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10y ago

Since 5 is a factor of 20, both of its factors are common.

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10y ago

The lowest common factor of any set of positive integers is 1.

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11y ago

The GCF is 5.

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6y ago

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Q: What is the lowest common factor for 5 and 20?
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