Available: MATHCOUNTS coaches only please. If you would like a full state-level (probably harder) MATHCOUNTS-style set to use for preparation for this year's state competition, please e-mail me at email@example.com and I will happily send a full copy with key.
MATHCOUNTS is the nation's premier middle school math competition. Below are links to materials provided on the MATHCOUNTS site, as well as lessons that are helpful preparation for the competition.
Ordering Materials is easy, and coaches starting programs can usually find funding. If you are interested in starting a MATHCOUNTS program at your school (in North Carolina), there is usually funding available. Contact John Goebel (firstname.lastname@example.org) for information about available funding for a MATHCOUNTS team at your school.
From My Students: Student-submitted Mock MATHCOUNTS materials. If you find something wrong, please e-mail me ... I have been editing a lot of these very quickly and suspect I missed some things and made/missed some mistakes that should have been corrected.
Ten Essentialshort practice sets for MATHCOUNTS: Counting, Probability, Statistics (Mean, Median, Mode), Patterns, Pythagorean Theorem, Area, Three-Dimensional Geometry, Proportions/Ratios/Percents, Algebraic Equations, and Number Theory (Factoring). Need answers? These problems are tough! The key is here. Updated 12/31/2008
Number Theory: Primes, Divisibility, Factoring, Factoring 'Tricks', Factorials, Different Bases, Units Digits. (52 pages) Updated 1/28/2009.
Draft Counting unit. Mostly Completed now. (42 pages) Updated 2/26/08.
Draft Probability unit. Mostly complete, but could use some revisions. Updated 4/26/09.
Many more worksheets for MATHCOUNTS practice can be found on the Submit Contentpage of this site including sample workouts, lessons, and mock competitions written by some of the nation's top middle-schoolers.
Number Sense Worksheets 12345678910 as used by (4 time National MathCounts champion coach) Jeff Boyd's top flight math program in Texas. Keys HERE. Perhaps these are the reason why Bobby Shen knew LCM(14,15,16) before I read the question.
MathCounts Toolbox: From MATHCOUNTS, this is a very good list of things that every student should know.
27 Problems and full solutions which illustrate a number of important tricks used in middle-grades math competitions by Keone Hon.
A nice practice set from Matthew Crawford, AoPS author and founder of Mist Academy who has helped train many of the country's best young math students.