Find HCF and LCM of 90 and 144 by the prime factorization method.

The factors of 90 and 144 are

144 = 2 x 2 x 2 x 2 x 3 x 3

90 = 3 x 3 x 2 x 5.

L.C.M of 90 and 144 = 2 x 2 x 2 x 2 x 3 x 3 x 5 = 720.

HCF of 90 and 144 = 3 x 3 x 2 = 18

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