Find the HCF and LCM of 90 and 144 by prime factorisation method.
A
18 and 720
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B
720 and 18
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C
360 and 180
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D
180 and 720
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Solution
The correct option is A 18 and 720 Prime factorisation of 90 and 144: 90=2×3×3×5 144=2×2×2×2×3×3 ⇒HCF=2×32=18 LCM=24×32×5=720 ∴ HCF and LCM of 90 and 144 are 18 and 720 respectively.