Subtract 30/81 from 2/18
2/18 - 30/81 is -7/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 18 × 9 = 162,
2/18 = 2 × 9/18 × 9 = 18/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
30/81 = 30 × 2/81 × 2 = 60/162 - Subtract the two like fractions:
18/162 - 60/162 = 18 - 60/162 = -42/162 - After reducing the fraction, the answer is -7/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/18-30/81 2/18-60/81 2/36-30/81 6/18-30/81 2/18-90/81 2/54-30/81 10/18-30/81 2/90-30/81 14/18-30/81