Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 21/12 from 90/18

1st number: 5 0/18, 2nd number: 1 9/12

90/18 - 21/12 is 13/4.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 12 is 36
  2. For the 1st fraction, since 18 × 2 = 36,
    90/18 = 90 × 2/18 × 2 = 180/36
  3. Likewise, for the 2nd fraction, since 12 × 3 = 36,
    21/12 = 21 × 3/12 × 3 = 63/36
  4. Subtract the two fractions:
    180/36 - 63/36 = 180 - 63/36 = 117/36
  5. After reducing the fraction, the answer is 13/4
  6. In mixed form: 31/4

MathStep (Works offline)

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

Related:

© everydaycalculation.com