Subtract 15/54 from 2/21
2/21 - 15/54 is -23/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
2/21 = 2 × 18/21 × 18 = 36/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
15/54 = 15 × 7/54 × 7 = 105/378 - Subtract the two like fractions:
36/378 - 105/378 = 36 - 105/378 = -69/378 - After reducing the fraction, the answer is -23/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-15/54 2/21-30/54 2/42-15/54 6/21-15/54 2/21-45/54 2/63-15/54 10/21-15/54 2/21-75/54 14/21-15/54