Answers

Add 90/20 and 35/84

1^st number: 4 10/20, 2^nd number: 35/84

90/20 + 35/84 is 59/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 84 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 20 × 21 = 420,
   90/20 = 90 × 21/20 × 21 = 1890/420
3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
   35/84 = 35 × 5/84 × 5 = 175/420
4. Add the two like fractions:
   1890/420 + 175/420 = 1890 + 175/420 = 2065/420
5. 2065/420 simplified gives 59/12
6. So, 90/20 + 35/84 = 59/12
   In mixed form: 411/12

MathStep (Works offline)

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

Related: ⁹⁰/₂₀+⁷⁰/₈₄ ⁹⁰/₄₀+³⁵/₈₄ ⁹⁰/₆₀+³⁵/₈₄

Add Fractions Calculator