Subtract 81/10 from 54/7
1st number: 7 5/7, 2nd number: 8 1/10
54/7 - 81/10 is -27/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 7 × 10 = 70,
54/7 = 54 × 10/7 × 10 = 540/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
81/10 = 81 × 7/10 × 7 = 567/70 - Subtract the two like fractions:
540/70 - 567/70 = 540 - 567/70 = -27/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/14-81/10 54/7-81/20 54/21-81/10 54/7-81/30 54/35-81/10 54/7-81/50 54/49-81/10 54/7-81/70