Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 15/40 and 3/21

15/40 + 3/21 is 29/56.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 40 × 21 = 840,
    15/40 = 15 × 21/40 × 21 = 315/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    3/21 = 3 × 40/21 × 40 = 120/840
  4. Add the two like fractions:
    315/840 + 120/840 = 315 + 120/840 = 435/840
  5. 435/840 simplified gives 29/56
  6. So, 15/40 + 3/21 = 29/56

MathStep (Works offline)

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

Related:

© everydaycalculation.com