The LCM of 63 will depend upon the other number(s) with which the common multiple is, and will be one of the multiples of 63:
63, 126, 189, 252, 315, 378, 441, 504, 567, 630, 693, 756, 819, 882, 945, 1008, 1071, 1134, 1197, 1260, 1323, 1386, 1449, 1512, 1575, 1638, 1701, 1764, 1827, 1890, 1953, 2016, 2079, 2142, 2205, 2268, 2331, 2394, 2457, 2520, 2583, 2646, 2709, 2772, 2835, 2898, 2961, 3024, 3087, 3150, 3213, 3276, 3339, 3402, 3465, 3528, 3591, 3654, 3717, 3780, 3843, 3906, 3969, 4032, 4095, 4158, 4221, 4284, 4347, 4410, 4473, 4536, 4599, 4662, 4725, 4788, 4851, 4914, 4977, 5040, 5103, 5166, 5229, 5292, 5355, 5418, 5481, 5544, 5607, 5670, 5733, 5796, 5859, 5922, 5985, 6048, 6111, 6174, 6237, 6300, ...
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LCM OF 9,3 AND 21 IS 63. CHECK FOR YOURSELF IF YOU ARE NOT SURE.
The LCM is 756.
The LCM is 756.
The LCM of 81 and 63 is 567.
The least common multiple (LCM) of 63 and 275 is 17325.