Subtract 4/20 from 21/4
1st number: 5 1/4, 2nd number: 4/20
21/4 - 4/20 is 101/20.
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,
4/20 = 4 × 1/20 × 1 = 4/20 - Subtract the two like fractions:
105/20 - 4/20 = 105 - 4/20 = 101/20 - In mixed form: 51/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-4/20 21/4-8/20 21/8-4/20 21/4-4/40 63/4-4/20 21/4-12/20 21/12-4/20 21/4-4/60 21/20-4/20 21/4-28/20 21/28-4/20