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72/80 = 9/10
9/10 or 7/8 (cross multiply)
9 x 8 or 7 x 10
72 > 70
So that 72/80 > 7/8.
Wiki User
∙ 2009-12-03 00:50:41
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How do you know 72 80th is greater than 7 8th?
To compare 2 fractions you must make the denominator the same. We can do this in this problem by multiplying 7 and 8 by 10. This gives us 70 80ths. Now we can compare the 2 fractions and see that 72 80ths is bigger.
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