Subtract 21/27 from 8/15
8/15 - 21/27 is -11/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 27 is 135
Next, find the equivalent fraction of both fractional numbers with denominator 135 - For the 1st fraction, since 15 × 9 = 135,
8/15 = 8 × 9/15 × 9 = 72/135 - Likewise, for the 2nd fraction, since 27 × 5 = 135,
21/27 = 21 × 5/27 × 5 = 105/135 - Subtract the two like fractions:
72/135 - 105/135 = 72 - 105/135 = -33/135 - After reducing the fraction, the answer is -11/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15-21/27 8/15-42/27 8/30-21/27 8/15-21/54 24/15-21/27 8/15-63/27 8/45-21/27 8/15-21/81 40/15-21/27 8/75-21/27 56/15-21/27