Answers

Add 45/30 and 20/90

1^st number: 1 15/30, 2^nd number: 20/90

45/30 + 20/90 is 31/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 90 is 90
   
   Next, find the equivalent fraction of both fractional numbers with denominator 90
2. For the 1st fraction, since 30 × 3 = 90,
   45/30 = 45 × 3/30 × 3 = 135/90
3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
   20/90 = 20 × 1/90 × 1 = 20/90
4. Add the two like fractions:
   135/90 + 20/90 = 135 + 20/90 = 155/90
5. 155/90 simplified gives 31/18
6. So, 45/30 + 20/90 = 31/18
   In mixed form: 113/18

MathStep (Works offline)

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

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

Add Fractions Calculator