Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 8/20 and 15/42

8/20 + 15/42 is 53/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 42 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    8/20 = 8 × 21/20 × 21 = 168/420
  3. Likewise, for the 2nd fraction, since 42 × 10 = 420,
    15/42 = 15 × 10/42 × 10 = 150/420
  4. Add the two fractions:
    168/420 + 150/420 = 168 + 150/420 = 318/420
  5. 318/420 simplified gives 53/70
  6. So, 8/20 + 15/42 = 53/70

MathStep (Works offline)

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

Related:

© everydaycalculation.com