Subtract 70/81 from 72/9
1st number: 8 0/9, 2nd number: 70/81
72/9 - 70/81 is 578/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 9 × 9 = 81,
72/9 = 72 × 9/9 × 9 = 648/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
70/81 = 70 × 1/81 × 1 = 70/81 - Subtract the two like fractions:
648/81 - 70/81 = 648 - 70/81 = 578/81 - In mixed form: 711/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18-70/81 72/27-70/81 72/45-70/81 72/63-70/81