Factors of 24: 1,2,3,4,6,8,12 and 24. Factors of 90: 1,2,3,5,9,10,18,30,45 and 90. The HCF (highest common factor) is 3
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the HCF of 24 and 90 is 6
24 = 2×2×2×3
90 = 2 × 3×3 × 5
1, 2, 3, 4, 6, 8, 12 factors of 24
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45 factors of 90
The highest common factor is 6