The factors of 96 are:
1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96
The factors of 168 are:
1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84, 168
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24
28 is a factor of 168 {28 x 6 = 168}, so the LCM is 168
4 is indeed a factor of 96 since 4 x 24 = 96
1 + 2 = 3 which is a factor of 96 (32*3 = 96)
Use a factor tree. 96 48,2 24,2,2 12,2,2,2 6,2,2,2,2 3,2,2,2,2,2 The greatest prime factor of 96 is 3.