Mathematics for IGCSE & O level - Number (Section 1 - No. 11)
A rectangle has dimensions 240 mm by 204 mm. What is the largest possible side length for identical squares that can cover the rectangle completely?
6 mm
12 mm
24 mm
48 mm
Explanation
This is an HCF problem. You need to find the HCF of 240 and 204. The factors of 240 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, and 240. The factors of 204 are 1, 2, 3, 4, 6, 12, 17, 34, 51, 68, 102, and 204. The HCF is 12.
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