21 x 9 = 189 and 27 x 7 = 189. Its right check!
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The Least Common Multiple (LCM) for 21 70 is 210.
The Least Common Multiple (LCM) of (15, 21 and 27) is 945.
The Least Common Multiple of 18 and 21 is 126.
The least common multiple of 21, 42, 63, and 105 is 630.
The LCM of 7, 21 and 35 is 105.