Subtract 10/27 from 18/21
18/21 - 10/27 is 92/189.
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,
18/21 = 18 × 9/21 × 9 = 162/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
10/27 = 10 × 7/27 × 7 = 70/189 - Subtract the two like fractions:
162/189 - 70/189 = 162 - 70/189 = 92/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-10/27 18/21-20/27 18/42-10/27 18/21-10/54 54/21-10/27 18/21-30/27 18/63-10/27 18/21-10/81 90/21-10/27 18/21-50/27 18/21-70/27