Subtract 16/27 from 18/21
18/21 - 16/27 is 50/189.
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,
16/27 = 16 × 7/27 × 7 = 112/189 - Subtract the two like fractions:
162/189 - 112/189 = 162 - 112/189 = 50/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-16/27 18/21-32/27 18/42-16/27 18/21-16/54 54/21-16/27 18/21-48/27 18/63-16/27 18/21-16/81 90/21-16/27 18/21-80/27