Subtract 7/9 from 81/18
1st number: 4 9/18, 2nd number: 7/9
81/18 - 7/9 is 67/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 9 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 18 × 1 = 18,
81/18 = 81 × 1/18 × 1 = 81/18 - Likewise, for the 2nd fraction, since 9 × 2 = 18,
7/9 = 7 × 2/9 × 2 = 14/18 - Subtract the two like fractions:
81/18 - 14/18 = 81 - 14/18 = 67/18 - In mixed form: 313/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18-14/9 81/36-7/9 81/18-7/18 81/18-21/9 81/54-7/9 81/18-7/27 81/18-35/9 81/90-7/9 81/18-7/45 81/18-49/9 81/18-7/63