Find the highest common factor of 21 and 28.

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Solution

The correct option is A 7
21 = 1 × 21
= 3 × 7
Factors of 21: 1, 3, 7 and 21

28 = 1 × 28
= 2 × 14
= 4 × 7
Factors of 28: 1, 2, 4, 7, 14 and 28

Among the common factors: 1 and 7, 7 is the highest common factor.

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