Answer:
The gcf of 36 and 90 is 18.
List the factors of each number and find the highest common one:
36: 1, 2, 3, 4, 6, 9, 12, 18, 36
90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
The greatest common factor is 18
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