3, 6, 9, 12, ____, 18, 21, 24, 27, 30 ____, 6, 9, 12, 15, 18, 21, 24, 27, 30 3, 6, 9, 12, 15, 18, 21, 24, 27, ____ 3, ____, 9, 12, 15, 18, 21, 24, 27, 30 3, 6, 9, ____, 15, 18, 21, 24, 27, 30 3, 6, 9, 12, 15, 18, 21, 24, ____, 30

Counting by 3's

由
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