Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/16 and 18/90

1st number: 1 5/16, 2nd number: 18/90

21/16 + 18/90 is 121/80.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 16 and 90 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 16 × 45 = 720,
    21/16 = 21 × 45/16 × 45 = 945/720
  3. Likewise, for the 2nd fraction, since 90 × 8 = 720,
    18/90 = 18 × 8/90 × 8 = 144/720
  4. Add the two like fractions:
    945/720 + 144/720 = 945 + 144/720 = 1089/720
  5. 1089/720 simplified gives 121/80
  6. So, 21/16 + 18/90 = 121/80
    In mixed form: 141/80

MathStep (Works offline)

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

Related:

© everydaycalculation.com