Subtract 45/25 from 27/28, Solve 27/28

Subtract 45/25 from 27/28

1^st number: 27/28, 2^nd number: 1 20/25

27/28 - 45/25 is -117/140.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 25 is 700

Next, find the equivalent fraction of both fractional numbers with denominator 700
For the 1st fraction, since 28 × 25 = 700,
27/28 = 27 × 25/28 × 25 = 675/700
Likewise, for the 2nd fraction, since 25 × 28 = 700,
45/25 = 45 × 28/25 × 28 = 1260/700
Subtract the two like fractions:
675/700 - 1260/700 = 675 - 1260/700 = -585/700
After reducing the fraction, the answer is -117/140

MathStep (Works offline)

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