Subtract 80/9 from 7/28, Solve 7/28

Subtract 80/9 from 7/28

1^st number: 7/28, 2^nd number: 8 8/9

7/28 - 80/9 is -311/36.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 9 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 28 × 9 = 252,
7/28 = 7 × 9/28 × 9 = 63/252
Likewise, for the 2nd fraction, since 9 × 28 = 252,
80/9 = 80 × 28/9 × 28 = 2240/252
Subtract the two like fractions:
63/252 - 2240/252 = 63 - 2240/252 = -2177/252
After reducing the fraction, the answer is -311/36

MathStep (Works offline)

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