Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 18/12 from 3/21

1st number: 3/21, 2nd number: 1 6/12

3/21 - 18/12 is -19/14.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 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 12 × 7 = 84,
    18/12 = 18 × 7/12 × 7 = 126/84
  4. Subtract the two like fractions:
    12/84 - 126/84 = 12 - 126/84 = -114/84
  5. After reducing the fraction, the answer is -19/14

MathStep (Works offline)

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

Related:

© everydaycalculation.com