Subtract 20/56 from 21/2
1st number: 10 1/2, 2nd number: 20/56
21/2 - 20/56 is 71/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 56 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 2 × 28 = 56,
21/2 = 21 × 28/2 × 28 = 588/56 - Likewise, for the 2nd fraction, since 56 × 1 = 56,
20/56 = 20 × 1/56 × 1 = 20/56 - Subtract the two like fractions:
588/56 - 20/56 = 588 - 20/56 = 568/56 - After reducing the fraction, the answer is 71/7
- In mixed form: 101/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2-20/56 21/2-40/56 21/4-20/56 63/2-20/56 21/2-60/56 21/6-20/56 21/10-20/56 21/14-20/56