mathcounts notes

Sequences are fun to learn and not really that difficult.  There are many similarities between arithmetic and geometric sequences, so  lea...

First of all, problem of the week from Evan, a 5th grader: A man notices a sign in Shop-a-Lot that says: "All prices are marked 25% of...

Check out Mathcounts here, the best competition math program for middle school students. Download this year's Mathcounts handbook her...

These are some common sums that appear on Mathcounts often. \(1+2+3+\ldots +n=\dfrac {n\left( n+1\right) } {2}\)  \(2+4+6+\ldots .2n=n\l...