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Mathematics for IGCSE & O level - Number (Section 3 - No. 32)

What is the highest common factor (HCF) of 20 and 50?
2
5
10
20

Explanation

The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors of 50 are 1, 2, 5, 10, 25, and 50. The HCF is 10.

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