Common multiples include any multiple of 405.
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They are multiples of 1, 3 and 9.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90.
The two-digit multiples of nine are 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
The Multiples of 27: 27, 54, 81, 108, 135, .... Factors of 27: 1, 3, 9, 27 and 35. (27 = 33)