The prime factors of 105 are 5, 3 and 7. So to work out which two numbers have 105 as an LCM, we just have to share these factors between the two numbers, and add in any duplicates we want. For instance:
5x3 = 15
3x7 = 21
So 15 and 21 have a LCM of 105.
7x5 = 35
3x5 = 15
So 35 and 15 have a LCM of 105.
And so on.
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75 and 150, among others.
35 and 70, among others.
The least common multiple, or LCM, is the smallest positive integer that all the members of a given set of numbers will divide into evenly with no remainder.
1 and 36 12 and 18 4 and 9