Factor them.
2 x 2 x 5 = 20
2 x 3 x 3 x 5 = 90
Combine the highest number of each factor.
2 x 2 x 3 x 3 x 5 = 180, the LCM
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The least common multiple of 20 and 45 is 180.
The least common multiple of 8, 30 and 45 is 360.
180
The least common multiple of 45 , 3 , 5 = 45
The least common multiple of 915 , 45 = 2,745