Subtract 7/20 from 21/4
1st number: 5 1/4, 2nd number: 7/20
21/4 - 7/20 is 49/10.
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,
21/4 = 21 × 5/4 × 5 = 105/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
7/20 = 7 × 1/20 × 1 = 7/20 - Subtract the two like fractions:
105/20 - 7/20 = 105 - 7/20 = 98/20 - After reducing the fraction, the answer is 49/10
- In mixed form: 49/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-7/20 21/4-14/20 21/8-7/20 21/4-7/40 63/4-7/20 21/4-21/20 21/12-7/20 21/4-7/60 21/4-35/20 21/20-7/20 21/4-49/20 21/28-7/20