Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/15 and 12/9

1st number: 1 6/15, 2nd number: 1 3/9

21/15 + 12/9 is 41/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 9 is 45
  2. For the 1st fraction, since 15 × 3 = 45,
    21/15 = 21 × 3/15 × 3 = 63/45
  3. Likewise, for the 2nd fraction, since 9 × 5 = 45,
    12/9 = 12 × 5/9 × 5 = 60/45
  4. Add the two fractions:
    63/45 + 60/45 = 63 + 60/45 = 123/45
  5. 123/45 simplified gives 41/15
  6. So, 21/15 + 12/9 = 41/15
    In mixed form: 211/15

MathStep (Works offline)

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

Related:

© everydaycalculation.com