Subtract 21/20 from 90/14
1st number: 6 6/14, 2nd number: 1 1/20
90/14 - 21/20 is 753/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 14 × 10 = 140,
90/14 = 90 × 10/14 × 10 = 900/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
21/20 = 21 × 7/20 × 7 = 147/140 - Subtract the two like fractions:
900/140 - 147/140 = 900 - 147/140 = 753/140 - In mixed form: 553/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/14-42/20 90/28-21/20 90/14-21/40 90/14-63/20 90/42-21/20 90/14-21/60 90/70-21/20 90/98-21/20