Subtract 54/7 from 20/81
1st number: 20/81, 2nd number: 7 5/7
20/81 - 54/7 is -4234/567.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 7 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
20/81 = 20 × 7/81 × 7 = 140/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
54/7 = 54 × 81/7 × 81 = 4374/567 - Subtract the two like fractions:
140/567 - 4374/567 = 140 - 4374/567 = -4234/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81-54/7 20/81-54/14 60/81-54/7 20/81-54/21 20/81-54/35 20/81-54/49