Subtract 8/21 from 12/27
12/27 - 8/21 is 4/63.
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,
12/27 = 12 × 7/27 × 7 = 84/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
8/21 = 8 × 9/21 × 9 = 72/189 - Subtract the two like fractions:
84/189 - 72/189 = 84 - 72/189 = 12/189 - After reducing the fraction, the answer is 4/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/27-8/21 12/27-16/21 12/54-8/21 12/27-8/42 36/27-8/21 12/27-24/21 12/81-8/21 12/27-8/63 60/27-8/21 12/27-40/21 84/27-8/21 12/27-56/21