Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Add fractions

Add 21/28 and 12/9

1st number: 21/28, 2nd number: 1 3/9

21/28 + 12/9 is 25/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 9 is 252
  2. For the 1st fraction, since 28 × 9 = 252,
    21/28 = 21 × 9/28 × 9 = 189/252
  3. Likewise, for the 2nd fraction, since 9 × 28 = 252,
    12/9 = 12 × 28/9 × 28 = 336/252
  4. Add the two fractions:
    189/252 + 336/252 = 189 + 336/252 = 525/252
  5. After reducing the fraction, the answer is 25/12
  6. In mixed form: 21/12

MathStep (Works offline)

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

Related:

© everydaycalculation.com