Subtract 6/81 from 4/21
4/21 - 6/81 is 22/189.
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,
4/21 = 4 × 27/21 × 27 = 108/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
6/81 = 6 × 7/81 × 7 = 42/567 - Subtract the two like fractions:
108/567 - 42/567 = 108 - 42/567 = 66/567 - After reducing the fraction, the answer is 22/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-6/81 4/21-12/81 4/42-6/81 12/21-6/81 4/21-18/81 4/63-6/81 20/21-6/81 4/21-30/81 28/21-6/81 4/21-42/81