skip to Main Content


Einstein Circle

Using common denominators to add and subtract (not multiply or divide) fractions is another core skill set repeated throughout the exam. Mastery is required to advance to more complex problems.

a/x + b/y = (ay + bx)/xy

The product of all denominators is always one common denominator. The resulting numerator is the sum of each numerator multiplied by every other denominator.


Worksheet - Common Denominators

  • Required Skill Test
  • 10 Random Questions
  • No time limit
  • 80% correct required to Pass Skill
  • Exit and return to test (answer choices recorded)
  • Answered questions green/unread questions white.


©2018 All Rights Reserved.




Back To Top
×Close search