Subtract 9/81 from 8/7
1st number: 1 1/7, 2nd number: 9/81
8/7 - 9/81 is 65/63.
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,
8/7 = 8 × 81/7 × 81 = 648/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
9/81 = 9 × 7/81 × 7 = 63/567 - Subtract the two like fractions:
648/567 - 63/567 = 648 - 63/567 = 585/567 - After reducing the fraction, the answer is 65/63
- In mixed form: 12/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-9/81 8/7-18/81 8/14-9/81 24/7-9/81 8/7-27/81 8/21-9/81 40/7-9/81 8/7-45/81 8/35-9/81 56/7-9/81 8/7-63/81 8/49-9/81