Answers

Add 15/63 and 21/49

15/63 + 21/49 is 2/3.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 49 is 441
   
   Next, find the equivalent fraction of both fractional numbers with denominator 441
2. For the 1st fraction, since 63 × 7 = 441,
   15/63 = 15 × 7/63 × 7 = 105/441
3. Likewise, for the 2nd fraction, since 49 × 9 = 441,
   21/49 = 21 × 9/49 × 9 = 189/441
4. Add the two like fractions:
   105/441 + 189/441 = 105 + 189/441 = 294/441
5. 294/441 simplified gives 2/3
6. So, 15/63 + 21/49 = 2/3

MathStep (Works offline)

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

Related: ³⁰/₆₃+²¹/₄₉ ¹⁵/₆₃+⁴²/₄₉ ¹⁵/₆₃+²¹/₉₈ ⁴⁵/₆₃+²¹/₄₉ ¹⁵/₆₃+⁶³/₄₉ ⁷⁵/₆₃+²¹/₄₉

Add Fractions Calculator