Answers

Add 90/84 and 20/80

1^st number: 1 6/84, 2^nd number: 20/80

90/84 + 20/80 is 37/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 84 × 20 = 1680,
   90/84 = 90 × 20/84 × 20 = 1800/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   20/80 = 20 × 21/80 × 21 = 420/1680
4. Add the two like fractions:
   1800/1680 + 420/1680 = 1800 + 420/1680 = 2220/1680
5. 2220/1680 simplified gives 37/28
6. So, 90/84 + 20/80 = 37/28
   In mixed form: 19/28

MathStep (Works offline)

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

Related: ⁹⁰/₈₄+⁴⁰/₈₀ ⁹⁰/₈₄+⁶⁰/₈₀

Add Fractions Calculator