Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/42 and 20/30

21/42 + 20/30 is 7/6.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 30 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 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 30 × 7 = 210,
    20/30 = 20 × 7/30 × 7 = 140/210
  4. Add the two like fractions:
    105/210 + 140/210 = 105 + 140/210 = 245/210
  5. 245/210 simplified gives 7/6
  6. So, 21/42 + 20/30 = 7/6
    In mixed form: 11/6

MathStep (Works offline)

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

Related:

© everydaycalculation.com