Subtract 21/20 from 7/4
1st number: 1 3/4, 2nd number: 1 1/20
7/4 - 21/20 is 7/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
7/4 = 7 × 5/4 × 5 = 35/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
21/20 = 21 × 1/20 × 1 = 21/20 - Subtract the two like fractions:
35/20 - 21/20 = 35 - 21/20 = 14/20 - After reducing the fraction, the answer is 7/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4-21/20 7/4-42/20 7/8-21/20 7/4-21/40 21/4-21/20 7/4-63/20 7/12-21/20 7/4-21/60 35/4-21/20 7/20-21/20 49/4-21/20 7/28-21/20