Answers

Add 12/20 and 84/81

1^st number: 12/20, 2^nd number: 1 3/81

12/20 + 84/81 is 221/135.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 81 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 20 × 81 = 1620,
   12/20 = 12 × 81/20 × 81 = 972/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   84/81 = 84 × 20/81 × 20 = 1680/1620
4. Add the two like fractions:
   972/1620 + 1680/1620 = 972 + 1680/1620 = 2652/1620
5. 2652/1620 simplified gives 221/135
6. So, 12/20 + 84/81 = 221/135
   In mixed form: 186/135

MathStep (Works offline)

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

Related: ²⁴/₂₀+⁸⁴/₈₁ ¹²/₄₀+⁸⁴/₈₁ ³⁶/₂₀+⁸⁴/₈₁ ¹²/₆₀+⁸⁴/₈₁ ⁶⁰/₂₀+⁸⁴/₈₁ ⁸⁴/₂₀+⁸⁴/₈₁

Add Fractions Calculator