Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 40/5 and 15/21

1st number: 8 0/5, 2nd number: 15/21

40/5 + 15/21 is 61/7.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 5 × 21 = 105,
    40/5 = 40 × 21/5 × 21 = 840/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    15/21 = 15 × 5/21 × 5 = 75/105
  4. Add the two like fractions:
    840/105 + 75/105 = 840 + 75/105 = 915/105
  5. 915/105 simplified gives 61/7
  6. So, 40/5 + 15/21 = 61/7
    In mixed form: 85/7

MathStep (Works offline)

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

Related:

© everydaycalculation.com