Subtract 15/54 from 12/21
12/21 - 15/54 is 37/126.
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,
12/21 = 12 × 18/21 × 18 = 216/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
15/54 = 15 × 7/54 × 7 = 105/378 - Subtract the two like fractions:
216/378 - 105/378 = 216 - 105/378 = 111/378 - After reducing the fraction, the answer is 37/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-15/54 12/21-30/54 12/42-15/54 36/21-15/54 12/21-45/54 12/63-15/54 60/21-15/54 12/21-75/54 84/21-15/54