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3, 6, 9, 12, 15, 18, 21 ...> 163059 etc
3, 6, 9, 12, 15 and so on. 5, 10, 15, 20, 25 and so on. Common multiples include 15, 30, 45, 60, 75 and so on.
21, 42, 63 and so on.
the common multiple is 18
First 9 X 10 is easy to calculate. Any number times 10 is that number with a 0 added.9 X 10 = 90Then you just add the 9 to it to have the same answer as if you multiplied 9 X 11.90 + 9 = 99or9 X 11 = 99