mathcounts notes
The best math program for middle school students
Thursday, January 10, 2013
2013 Mathcounts Basic Concept Review: Some Common Sums/numbers
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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...
Monday, December 31, 2012
Harder Geometry Question from National Mathcounts
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Question: Similar to a 96 National Mathcounts question: Circles of the same colors are congruent and tangent to each other. What is the r...
Monday, December 24, 2012
2013 Mathcounts State Prep: Counting and Probability
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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...
Friday, December 21, 2012
2013 Mathcounts State Prep: Similar Triangles and Height to the Hypotenuse
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There are many concepts you can learn from this image, which cover numerous similar right triangles, ratio/proportion/dimensional chan...
Friday, December 14, 2012
Ratio, Proportions -- Beginning Problem Soving (SAT level)
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Questions: #1: At a county fair, if adults to kids ratio is 2 to 3 and there are 250 people at the fair. How many adults and how many kids?...
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