Subtract 15/81 from 1/4
1/4 - 15/81 is 7/108.
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,
1/4 = 1 × 81/4 × 81 = 81/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
15/81 = 15 × 4/81 × 4 = 60/324 - Subtract the two like fractions:
81/324 - 60/324 = 81 - 60/324 = 21/324 - After reducing the fraction, the answer is 7/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/4-15/81 1/4-30/81 1/8-15/81 3/4-15/81 1/4-45/81 1/12-15/81 5/4-15/81 1/4-75/81 1/20-15/81 7/4-15/81 1/28-15/81