Subtract 81/49 from 40/28, Solve 1 12/28

Subtract 81/49 from 40/28

1^st number: 1 12/28, 2^nd number: 1 32/49

40/28 - 81/49 is -11/49.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 49 is 196

Next, find the equivalent fraction of both fractional numbers with denominator 196
For the 1st fraction, since 28 × 7 = 196,
40/28 = 40 × 7/28 × 7 = 280/196
Likewise, for the 2nd fraction, since 49 × 4 = 196,
81/49 = 81 × 4/49 × 4 = 324/196
Subtract the two like fractions:
280/196 - 324/196 = 280 - 324/196 = -44/196
After reducing the fraction, the answer is -11/49

MathStep (Works offline)

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