Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 30/21 and 70/20

1st number: 1 9/21, 2nd number: 3 10/20

30/21 + 70/20 is 69/14.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420
  2. For the 1st fraction, since 21 × 20 = 420,
    30/21 = 30 × 20/21 × 20 = 600/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    70/20 = 70 × 21/20 × 21 = 1470/420
  4. Add the two fractions:
    600/420 + 1470/420 = 600 + 1470/420 = 2070/420
  5. 2070/420 simplified gives 69/14
  6. So, 30/21 + 70/20 = 69/14
    In mixed form: 413/14

MathStep (Works offline)

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

Related:

© everydaycalculation.com