Answers

Add 18/63 and 15/42

18/63 + 15/42 is 9/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 42 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 63 × 2 = 126,
   18/63 = 18 × 2/63 × 2 = 36/126
3. Likewise, for the 2nd fraction, since 42 × 3 = 126,
   15/42 = 15 × 3/42 × 3 = 45/126
4. Add the two like fractions:
   36/126 + 45/126 = 36 + 45/126 = 81/126
5. 81/126 simplified gives 9/14
6. So, 18/63 + 15/42 = 9/14

MathStep (Works offline)

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

Related: ³⁶/₆₃+¹⁵/₄₂ ¹⁸/₆₃+³⁰/₄₂ ¹⁸/₆₃+¹⁵/₈₄ ⁵⁴/₆₃+¹⁵/₄₂ ¹⁸/₆₃+⁴⁵/₄₂ ⁹⁰/₆₃+¹⁵/₄₂ ¹⁸/₆₃+⁷⁵/₄₂

Add Fractions Calculator