Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Subtract fractions

Subtract 9/21 from 9/40

9/40 - 9/21 is -57/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 21 is 840
  2. For the 1st fraction, since 40 × 21 = 840,
    9/40 = 9 × 21/40 × 21 = 189/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    9/21 = 9 × 40/21 × 40 = 360/840
  4. Subtract the two fractions:
    189/840 - 360/840 = 189 - 360/840 = -171/840
  5. After reducing the fraction, the answer is -57/280

Related:

Use fraction calculator with our all-in-one calculator app: Download for Android, Download for iOS

© everydaycalculation.com