Subtract 20/27 from 21/7
1st number: 3 0/7, 2nd number: 20/27
21/7 - 20/27 is 61/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 7 × 27 = 189,
21/7 = 21 × 27/7 × 27 = 567/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
20/27 = 20 × 7/27 × 7 = 140/189 - Subtract the two like fractions:
567/189 - 140/189 = 567 - 140/189 = 427/189 - After reducing the fraction, the answer is 61/27
- In mixed form: 27/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-20/27 21/7-40/27 21/14-20/27 21/7-20/54 63/7-20/27 21/7-60/27 21/7-20/81 21/35-20/27 21/49-20/27