Answers

Add 80/18 and 21/42

1^st number: 4 8/18, 2^nd number: 21/42

80/18 + 21/42 is 89/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 42 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 18 × 7 = 126,
   80/18 = 80 × 7/18 × 7 = 560/126
3. Likewise, for the 2nd fraction, since 42 × 3 = 126,
   21/42 = 21 × 3/42 × 3 = 63/126
4. Add the two like fractions:
   560/126 + 63/126 = 560 + 63/126 = 623/126
5. 623/126 simplified gives 89/18
6. So, 80/18 + 21/42 = 89/18
   In mixed form: 417/18

MathStep (Works offline)

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

Related: ⁸⁰/₃₆+²¹/₄₂ ⁸⁰/₁₈+²¹/₈₄ ⁸⁰/₁₈+⁶³/₄₂ ⁸⁰/₅₄+²¹/₄₂ ⁸⁰/₉₀+²¹/₄₂

Add Fractions Calculator