Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Add fractions

Add 12/21 and 45/81

12/21 + 45/81 is 71/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 81 is 567
  2. For the 1st fraction, since 21 × 27 = 567,
    12/21 = 12 × 27/21 × 27 = 324/567
  3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
    45/81 = 45 × 7/81 × 7 = 315/567
  4. Add the two fractions:
    324/567 + 315/567 = 324 + 315/567 = 639/567
  5. After reducing the fraction, the answer is 71/63
  6. In mixed form: 18/63

MathStep (Works offline)

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

Related:

© everydaycalculation.com