Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Add fractions

Add 15/21 and 35/80

15/21 + 35/80 is 129/112.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 80 is 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    15/21 = 15 × 80/21 × 80 = 1200/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    35/80 = 35 × 21/80 × 21 = 735/1680
  4. Add the two fractions:
    1200/1680 + 735/1680 = 1200 + 735/1680 = 1935/1680
  5. After reducing the fraction, the answer is 129/112
  6. In mixed form: 117/112

MathStep (Works offline)

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

Related:

© everydaycalculation.com