Subtract 90/81 from 70/7
1st number: 10 0/7, 2nd number: 1 9/81
70/7 - 90/81 is 80/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 7 × 81 = 567,
70/7 = 70 × 81/7 × 81 = 5670/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
90/81 = 90 × 7/81 × 7 = 630/567 - Subtract the two like fractions:
5670/567 - 630/567 = 5670 - 630/567 = 5040/567 - After reducing the fraction, the answer is 80/9
- In mixed form: 88/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/14-90/81 70/21-90/81 70/35-90/81 70/49-90/81