Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 12/28 from 3/21

3/21 - 12/28 is -2/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 28 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    3/21 = 3 × 4/21 × 4 = 12/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    12/28 = 12 × 3/28 × 3 = 36/84
  4. Subtract the two like fractions:
    12/84 - 36/84 = 12 - 36/84 = -24/84
  5. After reducing the fraction, the answer is -2/7

MathStep (Works offline)

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

Related:

© everydaycalculation.com