Subtract 35/49 from 20/72, Solve 20/72

Subtract 35/49 from 20/72

20/72 - 35/49 is -55/126.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 49 is 3528

Next, find the equivalent fraction of both fractional numbers with denominator 3528
For the 1st fraction, since 72 × 49 = 3528,
20/72 = 20 × 49/72 × 49 = 980/3528
Likewise, for the 2nd fraction, since 49 × 72 = 3528,
35/49 = 35 × 72/49 × 72 = 2520/3528
Subtract the two like fractions:
980/3528 - 2520/3528 = 980 - 2520/3528 = -1540/3528
After reducing the fraction, the answer is -55/126

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