mathcounts notes

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...

Question: Similar to a 96 National Mathcounts question: Circles of the same colors are congruent and tangent to each other. What is the r...

Question #1: Rolling two dice, what is the probability that the product is a multiple of 3? Solution I : As long as one of the two numbers...

There are many concepts you can learn from this image, which cover numerous similar right triangles, ratio/proportion/dimensional chan...