Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 12/9 and 5/7

1st number: 1 3/9, 2nd number: 5/7

12/9 + 5/7 is 43/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 7 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 9 × 7 = 63,
    12/9 = 12 × 7/9 × 7 = 84/63
  3. Likewise, for the 2nd fraction, since 7 × 9 = 63,
    5/7 = 5 × 9/7 × 9 = 45/63
  4. Add the two like fractions:
    84/63 + 45/63 = 84 + 45/63 = 129/63
  5. 129/63 simplified gives 43/21
  6. So, 12/9 + 5/7 = 43/21
    In mixed form: 21/21

MathStep (Works offline)

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

Related:

© everydaycalculation.com