Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 84/80 from 12/42

1st number: 12/42, 2nd number: 1 4/80

12/42 - 84/80 is -107/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    12/42 = 12 × 40/42 × 40 = 480/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    84/80 = 84 × 21/80 × 21 = 1764/1680
  4. Subtract the two fractions:
    480/1680 - 1764/1680 = 480 - 1764/1680 = -1284/1680
  5. After reducing the fraction, the answer is -107/140

MathStep (Works offline)

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

Related:

© everydaycalculation.com