Subtract 12/54 from 1/21
1/21 - 12/54 is -11/63.
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,
1/21 = 1 × 18/21 × 18 = 18/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
12/54 = 12 × 7/54 × 7 = 84/378 - Subtract the two like fractions:
18/378 - 84/378 = 18 - 84/378 = -66/378 - After reducing the fraction, the answer is -11/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-12/54 1/21-24/54 1/42-12/54 3/21-12/54 1/21-36/54 1/63-12/54 5/21-12/54 1/21-60/54 7/21-12/54 1/21-84/54