Subtract 15/81 from 7/18
7/18 - 15/81 is 11/54.
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,
7/18 = 7 × 9/18 × 9 = 63/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
15/81 = 15 × 2/81 × 2 = 30/162 - Subtract the two like fractions:
63/162 - 30/162 = 63 - 30/162 = 33/162 - After reducing the fraction, the answer is 11/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18-15/81 7/18-30/81 7/36-15/81 21/18-15/81 7/18-45/81 7/54-15/81 35/18-15/81 7/18-75/81 7/90-15/81 49/18-15/81