Answers

Add 84/15 and 80/84

1^st number: 5 9/15, 2^nd number: 80/84

84/15 + 80/84 is 688/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 84 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 15 × 28 = 420,
   84/15 = 84 × 28/15 × 28 = 2352/420
3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
   80/84 = 80 × 5/84 × 5 = 400/420
4. Add the two like fractions:
   2352/420 + 400/420 = 2352 + 400/420 = 2752/420
5. 2752/420 simplified gives 688/105
6. So, 84/15 + 80/84 = 688/105
   In mixed form: 658/105

MathStep (Works offline)

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

Related: ⁸⁴/₃₀+⁸⁰/₈₄ ⁸⁴/₄₅+⁸⁰/₈₄ ⁸⁴/₇₅+⁸⁰/₈₄

Add Fractions Calculator