Various exercises

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Grade Vs Difficulty:
  EasyModerateChallengingPerplexing
1-2
3-4
5-6
7-8
9-10
11-12
13-14

The four lessons attached in the following website serve as good warm-up exercises for experienced learners or as problem solving exercises for beginners. The activities cover the following topics:
* sum of consecutive integers
* visual proof of Pythagorean theorem
* Dividing rectangle and circle
* Variable to solve equation

http://www.pi-math.org/page2.php