Mathematics for IGCSE & O level - Number (Section 1 - No. 13)
Which of the following is a common factor of 18 and 24?
5
7
3
11
Explanation
Factors of 18: 1, 2, 3, 6, 9, 18. Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24. 3 is a factor of both.
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