Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 15/42 and 21/81

15/42 + 21/81 is 233/378.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 81 is 1134

    Next, find the equivalent fraction of both fractional numbers with denominator 1134
  2. For the 1st fraction, since 42 × 27 = 1134,
    15/42 = 15 × 27/42 × 27 = 405/1134
  3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
    21/81 = 21 × 14/81 × 14 = 294/1134
  4. Add the two like fractions:
    405/1134 + 294/1134 = 405 + 294/1134 = 699/1134
  5. 699/1134 simplified gives 233/378
  6. So, 15/42 + 21/81 = 233/378

MathStep (Works offline)

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

Related:

© everydaycalculation.com