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63 = 32 x 7 I added:The factorization of 63 is 7, 3, and 3. 63 = 1 x 6363 = 3 x 2163 = 7 x 9OR3 x 3 x 7
The least common multiple for 7 and 9 is 63.
7 is a factor of 28 because 4 x 7 equals 28. 7 is a factor of 63 because 9 x 7 = 63. That makes 7 a common factor of 28 and 63. The factors of 28 that are larger than 7 are 14 and 28. The factors of 63 that are larger than 7 are 9, 21 and 63. Since none of those numbers are the same, that makes 7 the greatest common factor of 28 and 63.
1 x 63, 3 x 21, 7 x 9, 9 x 7, 21 x 3, 63 x 1.
The LCM of 7 and 9 is 63.