Question
Find H.C.F. and L.C.M. of 56 and 112 by prime factorisation method.

Answer

Using the factor tree we have,
$56=2^3 \times 7$ and $112=2^4 \times 7$
Hence HCF is $2^3 \times 7=56$
and LCM is $2^4 \times 7=112$

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