mathcounts notes
The best math program for middle school students
Saturday, June 23, 2012
Mental Math Tricks I
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Multiples of 11: 11 x 14 = 1 ___ 4 , the middle number is (1 + 4) so the answer is 154 Let's try a few calculations mentally. 11 x...
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Saturday, June 16, 2012
Mathcounts strategies: Some sums
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The following sequences are all arithmetic sequences and for any arithmetic sequences, the sum is always average times the terms (how ma...
Monday, June 11, 2012
Painted Cube Problems: Beginning Level
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Please refrain yourself from checking the answers too soon. Use Lego blocks, unit cubes, or Rubik's cubes to help you think. If you are...
Tuesday, June 5, 2012
Polygon Part II: Interior/Exterior angles, Central Angles and Diagonals and Practice Problems
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Learn the Basics here: Polygon Part I Some important notes: #1: Sum of all the interior angle of an n-sided polygon is \((n-2) * 180\) ...
Monday, May 28, 2012
Prime Factorization : Part II
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Learn basic facts here. Another fun trick is to find the total number of factors any number has. To do this, take the...
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