Subtract 3/27 from 9/21
9/21 - 3/27 is 20/63.
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,
9/21 = 9 × 9/21 × 9 = 81/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
3/27 = 3 × 7/27 × 7 = 21/189 - Subtract the two like fractions:
81/189 - 21/189 = 81 - 21/189 = 60/189 - After reducing the fraction, the answer is 20/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-3/27 9/21-6/27 9/42-3/27 9/21-3/54 27/21-3/27 9/21-9/27 9/63-3/27 9/21-3/81 45/21-3/27 9/21-15/27 63/21-3/27 9/21-21/27