Mathematical Kangaroo
From AoPSWiki
Mathematical Kangaroo, a.k.a. International Mathematical Kangaroo may be the world's largest mathematics competition with students in grades 2-12 (in U.S. grades) competing from many nations around the world.
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Mathematical Kangaroo, a.k.a. International Mathematical Kangaroo may be the world's largest mathematics competition with students in grades 2-12 (in U.S. grades) competing from many nations around the world.

