Answers

Subtract 40/49 from 30/81

30/81 - 40/49 is -590/1323.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 49 is 3969
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3969
2. For the 1st fraction, since 81 × 49 = 3969,
   30/81 = 30 × 49/81 × 49 = 1470/3969
3. Likewise, for the 2nd fraction, since 49 × 81 = 3969,
   40/49 = 40 × 81/49 × 81 = 3240/3969
4. Subtract the two like fractions:
   1470/3969 - 3240/3969 = 1470 - 3240/3969 = -1770/3969
5. After reducing the fraction, the answer is -590/1323

MathStep (Works offline)

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

Related: ⁶⁰/₈₁-⁴⁰/₄₉ ³⁰/₈₁-⁸⁰/₄₉ ³⁰/₈₁-⁴⁰/₉₈ ⁹⁰/₈₁-⁴⁰/₄₉

Subtract Fractions Calculator