Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Add fractions

Add 21/2 and 15/8

1st number: 10 1/2, 2nd number: 1 7/8

21/2 + 15/8 is 99/8.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 2 and 8 is 8
  2. For the 1st fraction, since 2 × 4 = 8,
    21/2 = 21 × 4/2 × 4 = 84/8
  3. Likewise, for the 2nd fraction, since 8 × 1 = 8,
    15/8 = 15 × 1/8 × 1 = 15/8
  4. Add the two fractions:
    84/8 + 15/8 = 84 + 15/8 = 99/8
  5. In mixed form: 123/8

MathStep (Works offline)

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

Related:

© everydaycalculation.com