Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 5/21 and 25/40

5/21 + 25/40 is 145/168.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    5/21 = 5 × 40/21 × 40 = 200/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    25/40 = 25 × 21/40 × 21 = 525/840
  4. Add the two like fractions:
    200/840 + 525/840 = 200 + 525/840 = 725/840
  5. 725/840 simplified gives 145/168
  6. So, 5/21 + 25/40 = 145/168

MathStep (Works offline)

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

Related:

© everydaycalculation.com