Answers

Add 20/84 and 35/90

20/84 + 35/90 is 79/126.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 90 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 84 × 15 = 1260,
   20/84 = 20 × 15/84 × 15 = 300/1260
3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
   35/90 = 35 × 14/90 × 14 = 490/1260
4. Add the two like fractions:
   300/1260 + 490/1260 = 300 + 490/1260 = 790/1260
5. 790/1260 simplified gives 79/126
6. So, 20/84 + 35/90 = 79/126

MathStep (Works offline)

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

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

Add Fractions Calculator