Answers

Add 84/18 and 15/72

1^st number: 4 12/18, 2^nd number: 15/72

84/18 + 15/72 is 39/8.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 72 is 72
   
   Next, find the equivalent fraction of both fractional numbers with denominator 72
2. For the 1st fraction, since 18 × 4 = 72,
   84/18 = 84 × 4/18 × 4 = 336/72
3. Likewise, for the 2nd fraction, since 72 × 1 = 72,
   15/72 = 15 × 1/72 × 1 = 15/72
4. Add the two like fractions:
   336/72 + 15/72 = 336 + 15/72 = 351/72
5. 351/72 simplified gives 39/8
6. So, 84/18 + 15/72 = 39/8
   In mixed form: 47/8

MathStep (Works offline)

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

Related: ⁸⁴/₁₈+³⁰/₇₂ ⁸⁴/₃₆+¹⁵/₇₂ ⁸⁴/₁₈+⁴⁵/₇₂ ⁸⁴/₅₄+¹⁵/₇₂ ⁸⁴/₁₈+⁷⁵/₇₂ ⁸⁴/₉₀+¹⁵/₇₂

Add Fractions Calculator