Answers

Add 7/2 and 90/81

1^st number: 3 1/2, 2^nd number: 1 9/81

7/2 + 90/81 is 83/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 2 and 81 is 162
   
   Next, find the equivalent fraction of both fractional numbers with denominator 162
2. For the 1st fraction, since 2 × 81 = 162,
   7/2 = 7 × 81/2 × 81 = 567/162
3. Likewise, for the 2nd fraction, since 81 × 2 = 162,
   90/81 = 90 × 2/81 × 2 = 180/162
4. Add the two like fractions:
   567/162 + 180/162 = 567 + 180/162 = 747/162
5. 747/162 simplified gives 83/18
6. So, 7/2 + 90/81 = 83/18
   In mixed form: 411/18

MathStep (Works offline)

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

Related: ¹⁴/₂+⁹⁰/₈₁ ⁷/₄+⁹⁰/₈₁ ²¹/₂+⁹⁰/₈₁ ⁷/₆+⁹⁰/₈₁ ³⁵/₂+⁹⁰/₈₁ ⁷/₁₀+⁹⁰/₈₁ ⁴⁹/₂+⁹⁰/₈₁ ⁷/₁₄+⁹⁰/₈₁

Add Fractions Calculator