Subtract 49/48 from 80/42, Solve 1 38/42

Subtract 49/48 from 80/42

1^st number: 1 38/42, 2^nd number: 1 1/48

80/42 - 49/48 is 99/112.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 48 is 336

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 42 × 8 = 336,
80/42 = 80 × 8/42 × 8 = 640/336
Likewise, for the 2nd fraction, since 48 × 7 = 336,
49/48 = 49 × 7/48 × 7 = 343/336
Subtract the two like fractions:
640/336 - 343/336 = 640 - 343/336 = 297/336
After reducing the fraction, the answer is 99/112

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad