Convert all lengths to cm: 513, 1134, 1215. Longest rod that measures all exactly is their HCF. 513=33×19, 1134=2×34×7, 1215=35×5. Common factor is 33=27. So HCF = 27 cm.
Find the length of the longest rod which can be used to measure exactly the lengths 5 m 13 cm, 11 m 34 cm and 12 m 15 cm.
Held on 5 Jun 2023 · Verified 13 Jul 2026.
11 cm
9 cm
1 m 3 cm
27 cm
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