The GREATEST common factor is 9 9 x 4 = 36; 9 x 5 = 45. 1 is always the least common factor between/among numbers.

Greatest Common Factor > GCF

Factors of 36 and 45:

36: (1, 2, 3, 4, 6, 9, 12, 18, 36)

45: (1, 3, 5, 9, 15, 45)

GCF is 9.

Not that difficult, is it?

9

3x3x4 = 36

3x3x5 = 45

Therefore, 3 is the greatest common factor

3

The greatest common denominator is 36x45=1620

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