Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 42/21 and 5/20

1st number: 2 0/21, 2nd number: 5/20

42/21 + 5/20 is 9/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    42/21 = 42 × 20/21 × 20 = 840/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    5/20 = 5 × 21/20 × 21 = 105/420
  4. Add the two like fractions:
    840/420 + 105/420 = 840 + 105/420 = 945/420
  5. 945/420 simplified gives 9/4
  6. So, 42/21 + 5/20 = 9/4
    In mixed form: 21/4

MathStep (Works offline)

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

Related:

© everydaycalculation.com