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LCM = product/HCF; the HCF of 27 and 45 is 9 so LCM is 27 x 45/9 ie 135.
LCM is the smallest multiple of 2 numbers and can be found by factoring both numbers and multiplying the prime factors having the highest powers.
Prime factors of 27 are 33
Prime factors of 45 are 32 x 5
LCM of 27 and 45 is 33x 5 = 135
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