Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 18/20 from 42/80

42/80 - 18/20 is -3/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 20 is 80
  2. For the 1st fraction, since 80 × 1 = 80,
    42/80 = 42 × 1/80 × 1 = 42/80
  3. Likewise, for the 2nd fraction, since 20 × 4 = 80,
    18/20 = 18 × 4/20 × 4 = 72/80
  4. Subtract the two fractions:
    42/80 - 72/80 = 42 - 72/80 = -30/80
  5. After reducing the fraction, the answer is -3/8

MathStep (Works offline)

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

Related:

© everydaycalculation.com