Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 18/21 and 9/8

1st number: 18/21, 2nd number: 1 1/8

18/21 + 9/8 is 111/56.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 21 × 8 = 168,
    18/21 = 18 × 8/21 × 8 = 144/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    9/8 = 9 × 21/8 × 21 = 189/168
  4. Add the two like fractions:
    144/168 + 189/168 = 144 + 189/168 = 333/168
  5. 333/168 simplified gives 111/56
  6. So, 18/21 + 9/8 = 111/56
    In mixed form: 155/56

MathStep (Works offline)

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

Related:

© everydaycalculation.com