Subtract 45/84 from 72/80, Solve 72/80

Subtract 45/84 from 72/80

72/80 - 45/84 is 51/140.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 84 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 80 × 21 = 1680,
72/80 = 72 × 21/80 × 21 = 1512/1680
Likewise, for the 2nd fraction, since 84 × 20 = 1680,
45/84 = 45 × 20/84 × 20 = 900/1680
Subtract the two like fractions:
1512/1680 - 900/1680 = 1512 - 900/1680 = 612/1680
After reducing the fraction, the answer is 51/140

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