Answers

Subtract 84/63 from 40/81

1^st number: 40/81, 2^nd number: 1 21/63

40/81 - 84/63 is -68/81.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 63 is 567
   
   Next, find the equivalent fraction of both fractional numbers with denominator 567
2. For the 1st fraction, since 81 × 7 = 567,
   40/81 = 40 × 7/81 × 7 = 280/567
3. Likewise, for the 2nd fraction, since 63 × 9 = 567,
   84/63 = 84 × 9/63 × 9 = 756/567
4. Subtract the two like fractions:
   280/567 - 756/567 = 280 - 756/567 = -476/567
5. After reducing the fraction, the answer is -68/81

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁸⁰/₈₁-⁸⁴/₆₃

Subtract Fractions Calculator