Answers

Add 90/20 and 36/80

1^st number: 4 10/20, 2^nd number: 36/80

90/20 + 36/80 is 99/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 80 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 20 × 4 = 80,
   90/20 = 90 × 4/20 × 4 = 360/80
3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
   36/80 = 36 × 1/80 × 1 = 36/80
4. Add the two like fractions:
   360/80 + 36/80 = 360 + 36/80 = 396/80
5. 396/80 simplified gives 99/20
6. So, 90/20 + 36/80 = 99/20
   In mixed form: 419/20

MathStep (Works offline)

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

Related: ⁹⁰/₂₀+⁷²/₈₀ ⁹⁰/₄₀+³⁶/₈₀ ⁹⁰/₆₀+³⁶/₈₀

Add Fractions Calculator