Critical thinking and number sense based math problems to challenge students of all grade levels. Most of these problems require more critical thinking and less number crunching than typical textbook math problems. Check back 5 days per week for a new problem.
Tuesday, November 18, 2008
5th-11th grade
At the G20 summit, 20 top world leaders get together. If every leader shakes every other leader's hand once, how many total hand shakes will occur?
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