Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/70 and 21/4

1st number: 21/70, 2nd number: 5 1/4

21/70 + 21/4 is 111/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 4 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 70 × 2 = 140,
    21/70 = 21 × 2/70 × 2 = 42/140
  3. Likewise, for the 2nd fraction, since 4 × 35 = 140,
    21/4 = 21 × 35/4 × 35 = 735/140
  4. Add the two like fractions:
    42/140 + 735/140 = 42 + 735/140 = 777/140
  5. 777/140 simplified gives 111/20
  6. So, 21/70 + 21/4 = 111/20
    In mixed form: 511/20

MathStep (Works offline)

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

Related:

© everydaycalculation.com