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lcm(2, 3, 5) = 30 → 2 digit common multiples are 30, 60, 90.
2 x 3 x 5 = 30 so that and 60
"The" five multiples is wrong; each integer has infinitely many multiples, not just five. To get multiples, in this case, please calculate: 30 x 1 30 x 2 etc.
Any multiples of 30 have these three factors. Multiples of 30.
There are 30 multiples of 4 between 5 and 125. Simply divide by 4 and solve for the multiples of 1 between 1.25 and 31.25. That is a range of 2 to 31, and there are 30 multiples. (31 - 2 + 1)