Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 4/7 from 5/21

5/21 - 4/7 is -1/3.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21

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

MathStep (Works offline)

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

Related:

© everydaycalculation.com