Subtract 4/81 from 30/9
1st number: 3 3/9, 2nd number: 4/81
30/9 - 4/81 is 266/81.
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,
30/9 = 30 × 9/9 × 9 = 270/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
4/81 = 4 × 1/81 × 1 = 4/81 - Subtract the two like fractions:
270/81 - 4/81 = 270 - 4/81 = 266/81 - In mixed form: 323/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/9-4/81 30/9-8/81 30/18-4/81 90/9-4/81 30/9-12/81 30/27-4/81 30/9-20/81 30/45-4/81 30/9-28/81 30/63-4/81