Answers

Add 90/20 and 60/81

1^st number: 4 10/20, 2^nd number: 60/81

90/20 + 60/81 is 283/54.

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,
   90/20 = 90 × 81/20 × 81 = 7290/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   60/81 = 60 × 20/81 × 20 = 1200/1620
4. Add the two like fractions:
   7290/1620 + 1200/1620 = 7290 + 1200/1620 = 8490/1620
5. 8490/1620 simplified gives 283/54
6. So, 90/20 + 60/81 = 283/54
   In mixed form: 513/54

MathStep (Works offline)

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

Related: ⁹⁰/₄₀+⁶⁰/₈₁ ⁹⁰/₆₀+⁶⁰/₈₁

Add Fractions Calculator