Subtract 30/54 from 20/40
20/40 - 30/54 is -1/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 54 is 1080
Next, find the equivalent fraction of both fractional numbers with denominator 1080 - For the 1st fraction, since 40 × 27 = 1080,
20/40 = 20 × 27/40 × 27 = 540/1080 - Likewise, for the 2nd fraction, since 54 × 20 = 1080,
30/54 = 30 × 20/54 × 20 = 600/1080 - Subtract the two like fractions:
540/1080 - 600/1080 = 540 - 600/1080 = -60/1080 - After reducing the fraction, the answer is -1/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-60/54 20/80-30/54 60/40-30/54 20/40-90/54