Subtract 1/81 from 6/21
6/21 - 1/81 is 155/567.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
6/21 = 6 × 27/21 × 27 = 162/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
1/81 = 1 × 7/81 × 7 = 7/567 - Subtract the two like fractions:
162/567 - 7/567 = 162 - 7/567 = 155/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-1/81 6/21-2/81 6/42-1/81 18/21-1/81 6/21-3/81 6/63-1/81 30/21-1/81 6/21-5/81 42/21-1/81 6/21-7/81