Answers

Add 10/21 and 84/81

1^st number: 10/21, 2^nd number: 1 3/81

10/21 + 84/81 is 286/189.

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,
   10/21 = 10 × 27/21 × 27 = 270/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   84/81 = 84 × 7/81 × 7 = 588/567
4. Add the two like fractions:
   270/567 + 588/567 = 270 + 588/567 = 858/567
5. 858/567 simplified gives 286/189
6. So, 10/21 + 84/81 = 286/189
   In mixed form: 197/189

MathStep (Works offline)

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

Related: ²⁰/₂₁+⁸⁴/₈₁ ¹⁰/₄₂+⁸⁴/₈₁ ³⁰/₂₁+⁸⁴/₈₁ ¹⁰/₆₃+⁸⁴/₈₁ ⁵⁰/₂₁+⁸⁴/₈₁ ⁷⁰/₂₁+⁸⁴/₈₁

Add Fractions Calculator