1,3,5,15 and 45
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135 = 33 * 5 315 = 5 * 43 It is 5 because 5 is in both rows. What about 15? Is it the greater common factor?
The common factors of 81 and 135 are: 1, 3, 9, and 27
LCM of 21 and 45=315 Factors of 21= 3x7 Factors of 45=3x3x5 Lcm= 3x5x7x3=315
The common factors of 25 and 45 are: 1 and 5
The GCF of 81 135 is 27