Answers

Add 45/20 and 30/90

1^st number: 2 5/20, 2^nd number: 30/90

45/20 + 30/90 is 31/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 20 × 9 = 180,
   45/20 = 45 × 9/20 × 9 = 405/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   30/90 = 30 × 2/90 × 2 = 60/180
4. Add the two like fractions:
   405/180 + 60/180 = 405 + 60/180 = 465/180
5. 465/180 simplified gives 31/12
6. So, 45/20 + 30/90 = 31/12
   In mixed form: 27/12

MathStep (Works offline)

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

Related: ⁹⁰/₂₀+³⁰/₉₀ ⁴⁵/₂₀+⁶⁰/₉₀ ⁴⁵/₄₀+³⁰/₉₀ ⁴⁵/₆₀+³⁰/₉₀

Add Fractions Calculator