Subtract 18/27 from 2/7
2/7 - 18/27 is -8/21.
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,
2/7 = 2 × 27/7 × 27 = 54/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
18/27 = 18 × 7/27 × 7 = 126/189 - Subtract the two like fractions:
54/189 - 126/189 = 54 - 126/189 = -72/189 - After reducing the fraction, the answer is -8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/7-18/27 2/7-36/27 2/14-18/27 2/7-18/54 6/7-18/27 2/7-54/27 2/21-18/27 2/7-18/81 10/7-18/27 2/7-90/27 2/35-18/27 14/7-18/27 2/49-18/27