Answers

Add 84/21 and 18/81

1^st number: 4 0/21, 2^nd number: 18/81

84/21 + 18/81 is 38/9.

Steps for adding fractions

1. 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
2. For the 1st fraction, since 21 × 27 = 567,
   84/21 = 84 × 27/21 × 27 = 2268/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   18/81 = 18 × 7/81 × 7 = 126/567
4. Add the two like fractions:
   2268/567 + 126/567 = 2268 + 126/567 = 2394/567
5. 2394/567 simplified gives 38/9
6. So, 84/21 + 18/81 = 38/9
   In mixed form: 42/9

MathStep (Works offline)

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

Related: ⁸⁴/₂₁+³⁶/₈₁ ⁸⁴/₄₂+¹⁸/₈₁ ⁸⁴/₂₁+⁵⁴/₈₁ ⁸⁴/₆₃+¹⁸/₈₁ ⁸⁴/₂₁+⁹⁰/₈₁

Add Fractions Calculator