Subtract 7/20 from 18/54
18/54 - 7/20 is -1/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 20 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 54 × 10 = 540,
18/54 = 18 × 10/54 × 10 = 180/540 - Likewise, for the 2nd fraction, since 20 × 27 = 540,
7/20 = 7 × 27/20 × 27 = 189/540 - Subtract the two like fractions:
180/540 - 189/540 = 180 - 189/540 = -9/540 - After reducing the fraction, the answer is -1/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/54-7/20 18/54-14/20 18/54-7/40 18/54-21/20 18/54-7/60 90/54-7/20 18/54-35/20 18/54-49/20