Subtract 30/18 from 2/81
1st number: 2/81, 2nd number: 1 12/18
2/81 - 30/18 is -133/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 18 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
2/81 = 2 × 2/81 × 2 = 4/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
30/18 = 30 × 9/18 × 9 = 270/162 - Subtract the two like fractions:
4/162 - 270/162 = 4 - 270/162 = -266/162 - After reducing the fraction, the answer is -133/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/81-30/18 2/81-60/18 2/81-30/36 6/81-30/18 2/81-90/18 2/81-30/54 10/81-30/18 2/81-30/90 14/81-30/18