Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Subtract fractions

Subtract 12/40 from 12/42

12/42 - 12/40 is -1/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840
  2. For the 1st fraction, since 42 × 20 = 840,
    12/42 = 12 × 20/42 × 20 = 240/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    12/40 = 12 × 21/40 × 21 = 252/840
  4. Subtract the two fractions:
    240/840 - 252/840 = 240 - 252/840 = -12/840
  5. After reducing the fraction, the answer is -1/70

MathStep (Works offline)

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

Related:

© everydaycalculation.com