Subtract 2/7 from 18/27
18/27 - 2/7 is 8/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 7 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
18/27 = 18 × 7/27 × 7 = 126/189 - Likewise, for the 2nd fraction, since 7 × 27 = 189,
2/7 = 2 × 27/7 × 27 = 54/189 - Subtract the two like fractions:
126/189 - 54/189 = 126 - 54/189 = 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: 36/27-2/7 18/27-4/7 18/54-2/7 18/27-2/14 54/27-2/7 18/27-6/7 18/81-2/7 18/27-2/21 90/27-2/7 18/27-10/7 18/27-2/35 18/27-14/7 18/27-2/49