Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 21/28 from 20/12

1st number: 1 8/12, 2nd number: 21/28

20/12 - 21/28 is 11/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 28 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 12 × 7 = 84,
    20/12 = 20 × 7/12 × 7 = 140/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    21/28 = 21 × 3/28 × 3 = 63/84
  4. Subtract the two like fractions:
    140/84 - 63/84 = 140 - 63/84 = 77/84
  5. After reducing the fraction, the answer is 11/12

MathStep (Works offline)

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

Related:

© everydaycalculation.com