Subtract 35/27 from 28/21
1st number: 1 7/21, 2nd number: 1 8/27
28/21 - 35/27 is 1/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
28/21 = 28 × 9/21 × 9 = 252/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
35/27 = 35 × 7/27 × 7 = 245/189 - Subtract the two like fractions:
252/189 - 245/189 = 252 - 245/189 = 7/189 - After reducing the fraction, the answer is 1/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-35/27 28/21-70/27 28/42-35/27 28/21-35/54 84/21-35/27 28/63-35/27 28/21-35/81