Answers

Add 90/12 and 81/18

1^st number: 7 6/12, 2^nd number: 4 9/18

90/12 + 81/18 is 12/1.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 18 is 36
   
   Next, find the equivalent fraction of both fractional numbers with denominator 36
2. For the 1st fraction, since 12 × 3 = 36,
   90/12 = 90 × 3/12 × 3 = 270/36
3. Likewise, for the 2nd fraction, since 18 × 2 = 36,
   81/18 = 81 × 2/18 × 2 = 162/36
4. Add the two like fractions:
   270/36 + 162/36 = 270 + 162/36 = 432/36
5. 432/36 simplified gives 12/1
6. So, 90/12 + 81/18 = 12/1

MathStep (Works offline)

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

Related: ⁹⁰/₂₄+⁸¹/₁₈ ⁹⁰/₁₂+⁸¹/₃₆ ⁹⁰/₃₆+⁸¹/₁₈ ⁹⁰/₁₂+⁸¹/₅₄ ⁹⁰/₆₀+⁸¹/₁₈ ⁹⁰/₁₂+⁸¹/₉₀ ⁹⁰/₈₄+⁸¹/₁₈

Add Fractions Calculator