Subtract 7/81 from 7/36
7/36 - 7/81 is 35/324.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 36 × 9 = 324,
7/36 = 7 × 9/36 × 9 = 63/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
7/81 = 7 × 4/81 × 4 = 28/324 - Subtract the two like fractions:
63/324 - 28/324 = 63 - 28/324 = 35/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/36-7/81 7/36-14/81 7/72-7/81 21/36-7/81 7/36-21/81 35/36-7/81 7/36-35/81 49/36-7/81 7/36-49/81