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Posted on Twitter this morning...
(100+99+98+...+51)-(1+2+3+...+50)=?
NO calculator/Noformulas!
Mental math - 30 seconds!
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Think there's a catch here because there's no such thing as free? Why not ask the teachers who have been receiving these?
Posted by
Dave Marain
at
9:35 AM
Link here to see MathNotations' ranking and other math sites/blogs as well.
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