Answers

Add 56/81 and 45/20

1^st number: 56/81, 2^nd number: 2 5/20

56/81 + 45/20 is 953/324.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 20 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 81 × 20 = 1620,
   56/81 = 56 × 20/81 × 20 = 1120/1620
3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
   45/20 = 45 × 81/20 × 81 = 3645/1620
4. Add the two like fractions:
   1120/1620 + 3645/1620 = 1120 + 3645/1620 = 4765/1620
5. 4765/1620 simplified gives 953/324
6. So, 56/81 + 45/20 = 953/324
   In mixed form: 2305/324

MathStep (Works offline)

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

Related: ⁵⁶/₈₁+⁹⁰/₂₀ ⁵⁶/₈₁+⁴⁵/₄₀ ⁵⁶/₈₁+⁴⁵/₆₀

Add Fractions Calculator