Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/42 and 3/20

21/42 + 3/20 is 13/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 42 × 10 = 420,
    21/42 = 21 × 10/42 × 10 = 210/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    3/20 = 3 × 21/20 × 21 = 63/420
  4. Add the two like fractions:
    210/420 + 63/420 = 210 + 63/420 = 273/420
  5. 273/420 simplified gives 13/20
  6. So, 21/42 + 3/20 = 13/20

MathStep (Works offline)

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

Related:

© everydaycalculation.com