Subtract 21/27 from 3/4
3/4 - 21/27 is -1/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 27 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 4 × 27 = 108,
3/4 = 3 × 27/4 × 27 = 81/108 - Likewise, for the 2nd fraction, since 27 × 4 = 108,
21/27 = 21 × 4/27 × 4 = 84/108 - Subtract the two like fractions:
81/108 - 84/108 = 81 - 84/108 = -3/108 - After reducing the fraction, the answer is -1/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/4-21/27 3/4-42/27 3/8-21/27 3/4-21/54 9/4-21/27 3/4-63/27 3/12-21/27 3/4-21/81 15/4-21/27 3/20-21/27 21/4-21/27 3/28-21/27