21, 42, 63, 84, 105, 126, 147, 168, 189, 210
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The first five multiples of 21 are: 21, 42, 63, 84, 105.
7, 14, 21, 28, 35, 42, 49, 56, 63, 707,14,21,28,35,42,49,56,63,70.
3.5,7,10.5,14,17.5,21,24.5,28,31.5,35
21, 42, 63, 84, 105.
3 6 9 12 15 18 21 24 27 30 those are 10