Answers

Add 90/81 and 12/15

1^st number: 1 9/81, 2^nd number: 12/15

90/81 + 12/15 is 86/45.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 15 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 81 × 5 = 405,
   90/81 = 90 × 5/81 × 5 = 450/405
3. Likewise, for the 2nd fraction, since 15 × 27 = 405,
   12/15 = 12 × 27/15 × 27 = 324/405
4. Add the two like fractions:
   450/405 + 324/405 = 450 + 324/405 = 774/405
5. 774/405 simplified gives 86/45
6. So, 90/81 + 12/15 = 86/45
   In mixed form: 141/45

MathStep (Works offline)

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

Related: ⁹⁰/₈₁+²⁴/₁₅ ⁹⁰/₈₁+¹²/₃₀ ⁹⁰/₈₁+³⁶/₁₅ ⁹⁰/₈₁+¹²/₄₅ ⁹⁰/₈₁+⁶⁰/₁₅ ⁹⁰/₈₁+¹²/₇₅ ⁹⁰/₈₁+⁸⁴/₁₅

Add Fractions Calculator