Answers

Add 2/21 and 9/81

2/21 + 9/81 is 13/63.

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,
   2/21 = 2 × 27/21 × 27 = 54/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   9/81 = 9 × 7/81 × 7 = 63/567
4. Add the two like fractions:
   54/567 + 63/567 = 54 + 63/567 = 117/567
5. 117/567 simplified gives 13/63
6. So, 2/21 + 9/81 = 13/63

MathStep (Works offline)

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

Related: ⁴/₂₁+⁹/₈₁ ²/₂₁+¹⁸/₈₁ ²/₄₂+⁹/₈₁ ⁶/₂₁+⁹/₈₁ ²/₂₁+²⁷/₈₁ ²/₆₃+⁹/₈₁ ¹⁰/₂₁+⁹/₈₁ ²/₂₁+⁴⁵/₈₁ ¹⁴/₂₁+⁹/₈₁ ²/₂₁+⁶³/₈₁

Add Fractions Calculator