Answers

Add 90/81 and 4/90

1^st number: 1 9/81, 2^nd number: 4/90

90/81 + 4/90 is 52/45.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 90 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 81 × 10 = 810,
   90/81 = 90 × 10/81 × 10 = 900/810
3. Likewise, for the 2nd fraction, since 90 × 9 = 810,
   4/90 = 4 × 9/90 × 9 = 36/810
4. Add the two like fractions:
   900/810 + 36/810 = 900 + 36/810 = 936/810
5. 936/810 simplified gives 52/45
6. So, 90/81 + 4/90 = 52/45
   In mixed form: 17/45

MathStep (Works offline)

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

Related: ⁹⁰/₈₁+⁸/₉₀ ⁹⁰/₈₁+¹²/₉₀ ⁹⁰/₈₁+²⁰/₉₀ ⁹⁰/₈₁+²⁸/₉₀

Add Fractions Calculator