Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 42/21 and 18/9

1st number: 2 0/21, 2nd number: 2 0/9

42/21 + 18/9 is 4/1.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    42/21 = 42 × 3/21 × 3 = 126/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    18/9 = 18 × 7/9 × 7 = 126/63
  4. Add the two fractions:
    126/63 + 126/63 = 126 + 126/63 = 252/63
  5. 252/63 simplified gives 4/1
  6. So, 42/21 + 18/9 = 4/1

MathStep (Works offline)

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

Related:

© everydaycalculation.com