Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/28 and 21/7

1st number: 21/28, 2nd number: 3 0/7

21/28 + 21/7 is 15/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 7 is 28

    Next, find the equivalent fraction of both fractional numbers with denominator 28
  2. For the 1st fraction, since 28 × 1 = 28,
    21/28 = 21 × 1/28 × 1 = 21/28
  3. Likewise, for the 2nd fraction, since 7 × 4 = 28,
    21/7 = 21 × 4/7 × 4 = 84/28
  4. Add the two like fractions:
    21/28 + 84/28 = 21 + 84/28 = 105/28
  5. 105/28 simplified gives 15/4
  6. So, 21/28 + 21/7 = 15/4
    In mixed form: 33/4

MathStep (Works offline)

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

Related:

© everydaycalculation.com