Subtract 21/12 from 28/4
1st number: 7 0/4, 2nd number: 1 9/12
28/4 - 21/12 is 21/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 4 × 3 = 12,
28/4 = 28 × 3/4 × 3 = 84/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
21/12 = 21 × 1/12 × 1 = 21/12 - Subtract the two like fractions:
84/12 - 21/12 = 84 - 21/12 = 63/12 - After reducing the fraction, the answer is 21/4
- In mixed form: 51/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/4-21/12 28/4-42/12 28/8-21/12 28/4-21/24 84/4-21/12 28/4-63/12 28/12-21/12 28/4-21/36 28/20-21/12 28/4-21/60 28/4-21/84