Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 42/28 and 21/20

1st number: 1 14/28, 2nd number: 1 1/20

42/28 + 21/20 is 51/20.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 28 × 5 = 140,
    42/28 = 42 × 5/28 × 5 = 210/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    21/20 = 21 × 7/20 × 7 = 147/140
  4. Add the two like fractions:
    210/140 + 147/140 = 210 + 147/140 = 357/140
  5. 357/140 simplified gives 51/20
  6. So, 42/28 + 21/20 = 51/20
    In mixed form: 211/20

MathStep (Works offline)

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

Related:

© everydaycalculation.com