Middle School - Math Olympiad

Last week our Middle School Mathletes jumped right in with our third Math Olympiad contest.  Mark you calendars as our fourth contest will be held during the week of 14 February. Keep up the effort Mathletes!
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Our last post left you with a Reindeer problem. Here is the solution:

Here's a new problem for this month: ​ 

You must cut a birthday cake into exactly eight pieces, but you're only allowed to make three straight cuts, and you can't move pieces of the cake as you cut.

​How can you do it?

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