Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 12/84 and 21/80

12/84 + 21/80 is 227/560.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 80 is 1680
  2. For the 1st fraction, since 84 × 20 = 1680,
    12/84 = 12 × 20/84 × 20 = 240/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    21/80 = 21 × 21/80 × 21 = 441/1680
  4. Add the two fractions:
    240/1680 + 441/1680 = 240 + 441/1680 = 681/1680
  5. 681/1680 simplified gives 227/560
  6. So, 12/84 + 21/80 = 227/560

MathStep (Works offline)

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

Related:

© everydaycalculation.com