Answers

Add 18/84 and 21/56

18/84 + 21/56 is 33/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 56 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 84 × 2 = 168,
   18/84 = 18 × 2/84 × 2 = 36/168
3. Likewise, for the 2nd fraction, since 56 × 3 = 168,
   21/56 = 21 × 3/56 × 3 = 63/168
4. Add the two like fractions:
   36/168 + 63/168 = 36 + 63/168 = 99/168
5. 99/168 simplified gives 33/56
6. So, 18/84 + 21/56 = 33/56

MathStep (Works offline)

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

Related: ³⁶/₈₄+²¹/₅₆ ¹⁸/₈₄+⁴²/₅₆ ⁵⁴/₈₄+²¹/₅₆ ¹⁸/₈₄+⁶³/₅₆ ⁹⁰/₈₄+²¹/₅₆

Add Fractions Calculator