Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 5/9 and 15/21

5/9 + 15/21 is 80/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 21 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 9 × 7 = 63,
    5/9 = 5 × 7/9 × 7 = 35/63
  3. Likewise, for the 2nd fraction, since 21 × 3 = 63,
    15/21 = 15 × 3/21 × 3 = 45/63
  4. Add the two like fractions:
    35/63 + 45/63 = 35 + 45/63 = 80/63
  5. So, 5/9 + 15/21 = 80/63
    In mixed form: 117/63

MathStep (Works offline)

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

Related:

© everydaycalculation.com