Subtract 28/12 from 75/21
1st number: 3 12/21, 2nd number: 2 4/12
75/21 - 28/12 is 26/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
75/21 = 75 × 4/21 × 4 = 300/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
28/12 = 28 × 7/12 × 7 = 196/84 - Subtract the two like fractions:
300/84 - 196/84 = 300 - 196/84 = 104/84 - After reducing the fraction, the answer is 26/21
- In mixed form: 15/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/21-56/12 75/42-28/12 75/21-28/24 75/21-84/12 75/63-28/12 75/21-28/36 75/21-28/60 75/21-28/84