What is the Highest Common Factor (HCF) of 5 and 8?

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Solution

The correct option is D 1
5 and 8 can be expressed as follows:

$5 = 1 \times 5$

$8 = 1 \times 8$
$8 = 2 \times 4$

$∴$ Factors of 5 = 1 and 5
Factors of 8 = 1, 2, 4 and 8

1 is the only common factor of 5 and 8.
$∴$ 1 is the Highest Common Factor (HCF) of 5 and 8.

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