Subtract 20/49 from 15/80, Solve 15/80

Subtract 20/49 from 15/80

15/80 - 20/49 is -173/784.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 49 is 3920

Next, find the equivalent fraction of both fractional numbers with denominator 3920
For the 1st fraction, since 80 × 49 = 3920,
15/80 = 15 × 49/80 × 49 = 735/3920
Likewise, for the 2nd fraction, since 49 × 80 = 3920,
20/49 = 20 × 80/49 × 80 = 1600/3920
Subtract the two like fractions:
735/3920 - 1600/3920 = 735 - 1600/3920 = -865/3920
After reducing the fraction, the answer is -173/784

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