Subtract 80/7 from 70/81
1st number: 70/81, 2nd number: 11 3/7
70/81 - 80/7 is -5990/567.
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,
70/81 = 70 × 7/81 × 7 = 490/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
80/7 = 80 × 81/7 × 81 = 6480/567 - Subtract the two like fractions:
490/567 - 6480/567 = 490 - 6480/567 = -5990/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/81-80/14 70/81-80/21 70/81-80/35 70/81-80/49