Subtract 21/27 from 2/5
2/5 - 21/27 is -17/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 27 is 135
Next, find the equivalent fraction of both fractional numbers with denominator 135 - For the 1st fraction, since 5 × 27 = 135,
2/5 = 2 × 27/5 × 27 = 54/135 - Likewise, for the 2nd fraction, since 27 × 5 = 135,
21/27 = 21 × 5/27 × 5 = 105/135 - Subtract the two like fractions:
54/135 - 105/135 = 54 - 105/135 = -51/135 - After reducing the fraction, the answer is -17/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/5-21/27 2/5-42/27 2/10-21/27 2/5-21/54 6/5-21/27 2/5-63/27 2/15-21/27 2/5-21/81 10/5-21/27 2/25-21/27 14/5-21/27 2/35-21/27