Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Add fractions

Add 28/21 and 12/5

1st number: 1 7/21, 2nd number: 2 2/5

28/21 + 12/5 is 56/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    28/21 = 28 × 5/21 × 5 = 140/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    12/5 = 12 × 21/5 × 21 = 252/105
  4. Add the two fractions:
    140/105 + 252/105 = 140 + 252/105 = 392/105
  5. After reducing the fraction, the answer is 56/15
  6. In mixed form: 311/15

MathStep (Works offline)

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

Related:

© everydaycalculation.com