Subtract 40/7 from 80/81
1st number: 80/81, 2nd number: 5 5/7
80/81 - 40/7 is -2680/567.
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,
80/81 = 80 × 7/81 × 7 = 560/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
40/7 = 40 × 81/7 × 81 = 3240/567 - Subtract the two like fractions:
560/567 - 3240/567 = 560 - 3240/567 = -2680/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/81-80/7 80/81-40/14 80/81-40/21 80/81-40/35 80/81-40/49