Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 42/72 and 18/21

42/72 + 18/21 is 121/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 21 is 504

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 72 × 7 = 504,
    42/72 = 42 × 7/72 × 7 = 294/504
  3. Likewise, for the 2nd fraction, since 21 × 24 = 504,
    18/21 = 18 × 24/21 × 24 = 432/504
  4. Add the two like fractions:
    294/504 + 432/504 = 294 + 432/504 = 726/504
  5. 726/504 simplified gives 121/84
  6. So, 42/72 + 18/21 = 121/84
    In mixed form: 137/84

MathStep (Works offline)

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

Related:

© everydaycalculation.com