2 x 3 x 5 = 30 so that and 60
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The LCM of 15 (which is 3*5) and 18 (which is 2*3^2) is 90 (which is 2*3^2*5).
lcm(2, 3, 5) = 30 → 2 digit common multiples are 30, 60, 90.
The first five positive integer multiples of 90 are: 1 x 90 = 90 2 x 90 = 180 3 x 90 = 270 4 x 90 = 360 5 x 90 = 450
8
Eight of them.