Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 80/15 and 20/21

1st number: 5 5/15, 2nd number: 20/21

80/15 + 20/21 is 44/7.

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,
    80/15 = 80 × 7/15 × 7 = 560/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    20/21 = 20 × 5/21 × 5 = 100/105
  4. Add the two like fractions:
    560/105 + 100/105 = 560 + 100/105 = 660/105
  5. 660/105 simplified gives 44/7
  6. So, 80/15 + 20/21 = 44/7
    In mixed form: 62/7

MathStep (Works offline)

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

Related:

© everydaycalculation.com