Subtract 6/81 from 9/7
1st number: 1 2/7, 2nd number: 6/81
9/7 - 6/81 is 229/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 7 × 81 = 567,
9/7 = 9 × 81/7 × 81 = 729/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
6/81 = 6 × 7/81 × 7 = 42/567 - Subtract the two like fractions:
729/567 - 42/567 = 729 - 42/567 = 687/567 - After reducing the fraction, the answer is 229/189
- In mixed form: 140/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/7-6/81 9/7-12/81 9/14-6/81 27/7-6/81 9/7-18/81 9/21-6/81 45/7-6/81 9/7-30/81 9/35-6/81 63/7-6/81 9/7-42/81 9/49-6/81