Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 72/81 from 90/45

1st number: 2 0/45, 2nd number: 72/81

90/45 - 72/81 is 10/9.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 81 is 405
  2. For the 1st fraction, since 45 × 9 = 405,
    90/45 = 90 × 9/45 × 9 = 810/405
  3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
    72/81 = 72 × 5/81 × 5 = 360/405
  4. Subtract the two fractions:
    810/405 - 360/405 = 810 - 360/405 = 450/405
  5. After reducing the fraction, the answer is 10/9
  6. In mixed form: 11/9

MathStep (Works offline)

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

Related:

© everydaycalculation.com