Subtract 3/21 from 21/4
1st number: 5 1/4, 2nd number: 3/21
21/4 - 3/21 is 143/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
21/4 = 21 × 21/4 × 21 = 441/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
3/21 = 3 × 4/21 × 4 = 12/84 - Subtract the two like fractions:
441/84 - 12/84 = 441 - 12/84 = 429/84 - After reducing the fraction, the answer is 143/28
- In mixed form: 53/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-3/21 21/4-6/21 21/8-3/21 21/4-3/42 63/4-3/21 21/4-9/21 21/12-3/21 21/4-3/63 21/4-15/21 21/20-3/21 21/28-3/21