Answer:
18
Explanation:
List your factors first to find the answer
36: 1-36, 2-18, 3-12, 4-9, 6-6
90: 1-90, 2-45, 3-30, 5-18, 6-15, 9-10
Now find in the factors which would be the greatest/largest. The largest factor shared between 36 and 90 is 18.
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