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Common multiples are multiples that are common to two or more numbers.
9: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135, 144, 153, 162, 171, 180, 189
21: 21, 42, 63, 84, 105, 126, 147, 168, 189
The first 3 common multiples of 9 and 21 are 63, 126 and 189.
63, 126, 189.
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