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OpenMiddle.com

openmiddle

Challenging math problems worth solving! 

"Open middle” problems have these characteristics:

  • they have a “closed beginning” meaning that they all start with the same initial problem.
  • they have a “closed end” meaning that they all end with the same answer.
  • they have an “open middle” meaning that there are multiple ways to approach and ultimately solve the problem.

http://www.openmiddle.com