Subtract 21/14 from 21/25, Solve 21/25

Subtract 21/14 from 21/25

1^st number: 21/25, 2^nd number: 1 7/14

21/25 - 21/14 is -33/50.

Find the least common denominator or LCM of the two denominators:
LCM of 25 and 14 is 350

Next, find the equivalent fraction of both fractional numbers with denominator 350
For the 1st fraction, since 25 × 14 = 350,
21/25 = 21 × 14/25 × 14 = 294/350
Likewise, for the 2nd fraction, since 14 × 25 = 350,
21/14 = 21 × 25/14 × 25 = 525/350
Subtract the two like fractions:
294/350 - 525/350 = 294 - 525/350 = -231/350
After reducing the fraction, the answer is -33/50

MathStep (Works offline)

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