Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Subtract fractions

Subtract 21/45 from 18/40

18/40 - 21/45 is -1/60.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 45 is 360
  2. For the 1st fraction, since 40 × 9 = 360,
    18/40 = 18 × 9/40 × 9 = 162/360
  3. Likewise, for the 2nd fraction, since 45 × 8 = 360,
    21/45 = 21 × 8/45 × 8 = 168/360
  4. Subtract the two fractions:
    162/360 - 168/360 = 162 - 168/360 = -6/360
  5. After reducing the fraction, the answer is -1/60

MathStep (Works offline)

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

Related:

© everydaycalculation.com