Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 21/8 from 12/9

1st number: 1 3/9, 2nd number: 2 5/8

12/9 - 21/8 is -31/24.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 8 is 72

    Next, find the equivalent fraction of both fractional numbers with denominator 72
  2. For the 1st fraction, since 9 × 8 = 72,
    12/9 = 12 × 8/9 × 8 = 96/72
  3. Likewise, for the 2nd fraction, since 8 × 9 = 72,
    21/8 = 21 × 9/8 × 9 = 189/72
  4. Subtract the two like fractions:
    96/72 - 189/72 = 96 - 189/72 = -93/72
  5. After reducing the fraction, the answer is -31/24

MathStep (Works offline)

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

Related:

© everydaycalculation.com