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The greatest common factor of 90 and 216 is 18
90 = 2 * 32 * 5
216 = 23 * 33
greatest common factor
= 2 * 32
= 2 * 9
= 18
90 / 18 = 5
216 / 18 = 12
because the greatest common factor of these is 1.
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What is the greatest common factor of 90 108 and 216?
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