Subtract 20/54 from 3/12
3/12 - 20/54 is -13/108.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 54 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 12 × 9 = 108,
3/12 = 3 × 9/12 × 9 = 27/108 - Likewise, for the 2nd fraction, since 54 × 2 = 108,
20/54 = 20 × 2/54 × 2 = 40/108 - Subtract the two like fractions:
27/108 - 40/108 = 27 - 40/108 = -13/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/12-20/54 3/12-40/54 3/24-20/54 9/12-20/54 3/12-60/54 3/36-20/54 15/12-20/54 3/60-20/54 21/12-20/54 3/84-20/54