Answers

Add 80/21 and 45/30

1^st number: 3 17/21, 2^nd number: 1 15/30

80/21 + 45/30 is 223/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 30 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 21 × 10 = 210,
   80/21 = 80 × 10/21 × 10 = 800/210
3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
   45/30 = 45 × 7/30 × 7 = 315/210
4. Add the two like fractions:
   800/210 + 315/210 = 800 + 315/210 = 1115/210
5. 1115/210 simplified gives 223/42
6. So, 80/21 + 45/30 = 223/42
   In mixed form: 513/42

MathStep (Works offline)

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

Related: ⁸⁰/₂₁+⁹⁰/₃₀ ⁸⁰/₄₂+⁴⁵/₃₀ ⁸⁰/₂₁+⁴⁵/₆₀ ⁸⁰/₆₃+⁴⁵/₃₀ ⁸⁰/₂₁+⁴⁵/₉₀

Add Fractions Calculator