Subtract 28/8 from 21/25
1st number: 21/25, 2nd number: 3 4/8
21/25 - 28/8 is -133/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 8 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 25 × 8 = 200,
21/25 = 21 × 8/25 × 8 = 168/200 - Likewise, for the 2nd fraction, since 8 × 25 = 200,
28/8 = 28 × 25/8 × 25 = 700/200 - Subtract the two like fractions:
168/200 - 700/200 = 168 - 700/200 = -532/200 - After reducing the fraction, the answer is -133/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25-28/8 21/25-56/8 21/50-28/8 21/25-28/16 63/25-28/8 21/25-84/8 21/75-28/8 21/25-28/24 21/25-28/40 21/25-28/56