Subtract 49/27 from 20/21
1st number: 20/21, 2nd number: 1 22/27
20/21 - 49/27 is -163/189.
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,
20/21 = 20 × 9/21 × 9 = 180/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
49/27 = 49 × 7/27 × 7 = 343/189 - Subtract the two like fractions:
180/189 - 343/189 = 180 - 343/189 = -163/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-49/27 20/21-98/27 20/42-49/27 20/21-49/54 60/21-49/27 20/63-49/27 20/21-49/81