It is: 6
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The Greatest Common Factor (GCF) is: 15
obviously, its highest common factor is the number itself. so the answer here is 90.
Common factors of 36, 72, and 90 are: 1, 2, 3, 6, 9, and 18.
The highest common factor is 9 _________________________________________ 72 = 2 x 2 x 2 x 3 x 3 45 = 3 x 3 x 5 90 = 2 x 3 x 3 x 5 factors in common: 3 x 3 (1, 3 & 9)
900