Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Subtract fractions

Subtract 21/8 from 28/84

1st number: 28/84, 2nd number: 2 5/8

28/84 - 21/8 is -55/24.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 8 is 168
  2. For the 1st fraction, since 84 × 2 = 168,
    28/84 = 28 × 2/84 × 2 = 56/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    21/8 = 21 × 21/8 × 21 = 441/168
  4. Subtract the two fractions:
    56/168 - 441/168 = 56 - 441/168 = -385/168
  5. After reducing the fraction, the answer is -55/24

MathStep (Works offline)

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

Related:

© everydaycalculation.com