Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 20/15 and 21/84

1st number: 1 5/15, 2nd number: 21/84

20/15 + 21/84 is 19/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 84 is 420
  2. For the 1st fraction, since 15 × 28 = 420,
    20/15 = 20 × 28/15 × 28 = 560/420
  3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
    21/84 = 21 × 5/84 × 5 = 105/420
  4. Add the two fractions:
    560/420 + 105/420 = 560 + 105/420 = 665/420
  5. 665/420 simplified gives 19/12
  6. So, 20/15 + 21/84 = 19/12
    In mixed form: 17/12

MathStep (Works offline)

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

Related:

© everydaycalculation.com