Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 20/30 and 21/28

20/30 + 21/28 is 17/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 28 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 30 × 14 = 420,
    20/30 = 20 × 14/30 × 14 = 280/420
  3. Likewise, for the 2nd fraction, since 28 × 15 = 420,
    21/28 = 21 × 15/28 × 15 = 315/420
  4. Add the two like fractions:
    280/420 + 315/420 = 280 + 315/420 = 595/420
  5. 595/420 simplified gives 17/12
  6. So, 20/30 + 21/28 = 17/12
    In mixed form: 15/12

MathStep (Works offline)

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

Related:

© everydaycalculation.com