Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 5/21 and 3/9

5/21 + 3/9 is 4/7.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    5/21 = 5 × 3/21 × 3 = 15/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    3/9 = 3 × 7/9 × 7 = 21/63
  4. Add the two like fractions:
    15/63 + 21/63 = 15 + 21/63 = 36/63
  5. 36/63 simplified gives 4/7
  6. So, 5/21 + 3/9 = 4/7

MathStep (Works offline)

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

Related:

© everydaycalculation.com