Subtract 9/21 from 20/27
20/27 - 9/21 is 59/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 21 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
20/27 = 20 × 7/27 × 7 = 140/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
9/21 = 9 × 9/21 × 9 = 81/189 - Subtract the two like fractions:
140/189 - 81/189 = 140 - 81/189 = 59/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/27-9/21 20/27-18/21 20/54-9/21 20/27-9/42 60/27-9/21 20/27-27/21 20/81-9/21 20/27-9/63 20/27-45/21 20/27-63/21