Subtract 18/81 from 3/4
3/4 - 18/81 is 19/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 4 × 81 = 324,
3/4 = 3 × 81/4 × 81 = 243/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
18/81 = 18 × 4/81 × 4 = 72/324 - Subtract the two like fractions:
243/324 - 72/324 = 243 - 72/324 = 171/324 - After reducing the fraction, the answer is 19/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/4-18/81 3/4-36/81 3/8-18/81 9/4-18/81 3/4-54/81 3/12-18/81 15/4-18/81 3/4-90/81 3/20-18/81 21/4-18/81 3/28-18/81