Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 81/90 from 8/12

8/12 - 81/90 is -7/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 90 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 12 × 15 = 180,
    8/12 = 8 × 15/12 × 15 = 120/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    81/90 = 81 × 2/90 × 2 = 162/180
  4. Subtract the two like fractions:
    120/180 - 162/180 = 120 - 162/180 = -42/180
  5. After reducing the fraction, the answer is -7/30

MathStep (Works offline)

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

Related:

© everydaycalculation.com