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1. Factorise 72 and 90.
2 Find the greatest common factor.
3. Divide both, 72 and 90 by their gcf.
So,
72 = 2*2*2*3*3 90 = 2*3*3*5 and their gcf = 2*3*3
Then 72/gcf = 2*2 = 4 and 90/gcf = 5
So 72/90 = 4/5
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