Answers

Add 72/18 and 90/84

1^st number: 4 0/18, 2^nd number: 1 6/84

72/18 + 90/84 is 71/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 84 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 18 × 14 = 252,
   72/18 = 72 × 14/18 × 14 = 1008/252
3. Likewise, for the 2nd fraction, since 84 × 3 = 252,
   90/84 = 90 × 3/84 × 3 = 270/252
4. Add the two like fractions:
   1008/252 + 270/252 = 1008 + 270/252 = 1278/252
5. 1278/252 simplified gives 71/14
6. So, 72/18 + 90/84 = 71/14
   In mixed form: 51/14

MathStep (Works offline)

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

Related: ⁷²/₃₆+⁹⁰/₈₄ ⁷²/₅₄+⁹⁰/₈₄ ⁷²/₉₀+⁹⁰/₈₄

Add Fractions Calculator