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Method of prime factorization is one of the best methods to find L.C.M.
Prime factorization of 81 = 3x3x3x3
Prime factorization of 70 = 2x5x7
It is clear that nothing is common in Prime Factorization of both numbers.
Also, L.C.M. = Product of common numbers x Product of uncommon factors
So, L.C.M. of 81 and 70 = Product of 81 and 70(Because nothing is common in 71 and 80) = 81 x 70 = 5670
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