80 factors to [2 2 2 2 5]
72 factors to [2 2 2 3 3]
Common factors are [2 2 2]
Common factors are {1 2 4 8} ■
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The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 ⇒ The common factors of 72 and 80 are: 1, 2, 4, 8,
The Least Common Multiple (LCM) of 72 and 80 is 720.
% rate= 72/80 * 100%= 0.9 * 100%= 90%
% rate = 90%=72/80 * 100%= 0.90 * 100%= 90%
Apart from 1, all of the other factors of 72 are multiples of prime factors.