12 factors: 1 2 3 4 6 8 9 12 18 24 36 72.
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1,2,3,4,6,9,12,18,36, and 72 are the nine factors of 72 and 72 < 100.
The factors of 17 are: 1, 17 The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Itself and any of its factors will divide evenly into -72 with no remainders.
The factors of 21 are 3x7 The prime factors of 72 are 2x2x2x3x3 So you need to multiply 2x2x2x3x3x7 2x2x2x3x3x7=504 Therefore the LCM of 21 and 72 is 504
The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.