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Since the lowest common multiple of 3 and 5 is 15, the common multiples of 3 and 5 are the multiples of 15: 30, 45, 60, 75, 90, etc...
The common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, 90
lcm(2, 3, 5) = 30 → 2 digit common multiples are 30, 60, 90.
The multiples of five between sixty and ninety (inclusive) are 60, 65, 70, 75, 80, 85 and 90.
To find the common multiples of 54 and 90, first list the multiples of each number. The multiples of 54 are 54, 108, 162, 216, etc. The multiples of 90 are 90, 180, 270, 360, etc. The common multiples of 54 and 90 are numbers that appear in both lists, such as 180 and 360.