Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 42/90 from 15/84

15/84 - 42/90 is -121/420.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 90 is 1260
  2. For the 1st fraction, since 84 × 15 = 1260,
    15/84 = 15 × 15/84 × 15 = 225/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    42/90 = 42 × 14/90 × 14 = 588/1260
  4. Subtract the two fractions:
    225/1260 - 588/1260 = 225 - 588/1260 = -363/1260
  5. After reducing the fraction, the answer is -121/420

MathStep (Works offline)

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

Related:

© everydaycalculation.com