Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/20 and 25/28

1st number: 1 1/20, 2nd number: 25/28

21/20 + 25/28 is 68/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 28 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 20 × 7 = 140,
    21/20 = 21 × 7/20 × 7 = 147/140
  3. Likewise, for the 2nd fraction, since 28 × 5 = 140,
    25/28 = 25 × 5/28 × 5 = 125/140
  4. Add the two like fractions:
    147/140 + 125/140 = 147 + 125/140 = 272/140
  5. 272/140 simplified gives 68/35
  6. So, 21/20 + 25/28 = 68/35
    In mixed form: 133/35

MathStep (Works offline)

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

Related:

© everydaycalculation.com