Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 5/15 and 7/21

5/15 + 7/21 is 2/3.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 15 × 7 = 105,
    5/15 = 5 × 7/15 × 7 = 35/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    7/21 = 7 × 5/21 × 5 = 35/105
  4. Add the two like fractions:
    35/105 + 35/105 = 35 + 35/105 = 70/105
  5. 70/105 simplified gives 2/3
  6. So, 5/15 + 7/21 = 2/3

MathStep (Works offline)

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

Related:

© everydaycalculation.com