Subtract 28/56 from 50/21
1st number: 2 8/21, 2nd number: 28/56
50/21 - 28/56 is 79/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
50/21 = 50 × 8/21 × 8 = 400/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
28/56 = 28 × 3/56 × 3 = 84/168 - Subtract the two like fractions:
400/168 - 84/168 = 400 - 84/168 = 316/168 - After reducing the fraction, the answer is 79/42
- In mixed form: 137/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/42-28/56 50/21-84/56 50/63-28/56