Subtract 20/81 from 1/4
1/4 - 20/81 is 1/324.
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,
20/81 = 20 × 4/81 × 4 = 80/324 - Subtract the two like fractions:
81/324 - 80/324 = 81 - 80/324 = 1/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/4-20/81 1/4-40/81 1/8-20/81 3/4-20/81 1/4-60/81 1/12-20/81 5/4-20/81 1/20-20/81 7/4-20/81 1/28-20/81