9.
Why? Because 9 x 6 = 54, and 9 x 5 = 45. No number larger than 9 is both a factor of 54 AND 45.
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The GCF of 35, 45 and 54 is just 1. There are no common factors between these 3 numbers aside from 1.
The greatest common factor of 54, 5, 36, and 45 is 1.
The greatest common factor of the numbers 24 and 54 is 6.
The GCF is 2.
Factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24 Factors of 45 are 1, 3, 5, 9, 15, and 45