Subtract 75/84 from 28/21
1st number: 1 7/21, 2nd number: 75/84
28/21 - 75/84 is 37/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
28/21 = 28 × 4/21 × 4 = 112/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
75/84 = 75 × 1/84 × 1 = 75/84 - Subtract the two like fractions:
112/84 - 75/84 = 112 - 75/84 = 37/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-75/84 28/42-75/84 84/21-75/84 28/63-75/84