Answers

Add 90/45 and 18/80

1^st number: 2 0/45, 2^nd number: 18/80

90/45 + 18/80 is 89/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 45 × 16 = 720,
   90/45 = 90 × 16/45 × 16 = 1440/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   18/80 = 18 × 9/80 × 9 = 162/720
4. Add the two like fractions:
   1440/720 + 162/720 = 1440 + 162/720 = 1602/720
5. 1602/720 simplified gives 89/40
6. So, 90/45 + 18/80 = 89/40
   In mixed form: 29/40

MathStep (Works offline)

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

Related: ⁹⁰/₄₅+³⁶/₈₀ ⁹⁰/₄₅+⁵⁴/₈₀ ⁹⁰/₄₅+⁹⁰/₈₀

Add Fractions Calculator