Answers

Add 21/84 and 25/36

21/84 + 25/36 is 17/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 36 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 84 × 3 = 252,
   21/84 = 21 × 3/84 × 3 = 63/252
3. Likewise, for the 2nd fraction, since 36 × 7 = 252,
   25/36 = 25 × 7/36 × 7 = 175/252
4. Add the two like fractions:
   63/252 + 175/252 = 63 + 175/252 = 238/252
5. 238/252 simplified gives 17/18
6. So, 21/84 + 25/36 = 17/18

MathStep (Works offline)

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

Related: ⁴²/₈₄+²⁵/₃₆ ²¹/₈₄+⁵⁰/₃₆ ²¹/₈₄+²⁵/₇₂ ⁶³/₈₄+²⁵/₃₆ ²¹/₈₄+⁷⁵/₃₆

Add Fractions Calculator