Subtract 8/27 from 7/21
7/21 - 8/27 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,
7/21 = 7 × 9/21 × 9 = 63/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
8/27 = 8 × 7/27 × 7 = 56/189 - Subtract the two like fractions:
63/189 - 56/189 = 63 - 56/189 = 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: 14/21-8/27 7/21-16/27 7/42-8/27 7/21-8/54 7/21-24/27 7/63-8/27 7/21-8/81 35/21-8/27 7/21-40/27 49/21-8/27 7/21-56/27