Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/42 and 54/15

1st number: 21/42, 2nd number: 3 9/15

21/42 + 54/15 is 41/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 15 is 210
  2. For the 1st fraction, since 42 × 5 = 210,
    21/42 = 21 × 5/42 × 5 = 105/210
  3. Likewise, for the 2nd fraction, since 15 × 14 = 210,
    54/15 = 54 × 14/15 × 14 = 756/210
  4. Add the two fractions:
    105/210 + 756/210 = 105 + 756/210 = 861/210
  5. 861/210 simplified gives 41/10
  6. So, 21/42 + 54/15 = 41/10
    In mixed form: 41/10

MathStep (Works offline)

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

Related:

© everydaycalculation.com