National Council of Teachers of Mathematics
Nctm: Figure This: Cut the Cake
A math challenge where geometry, measurement, and problem solving meet. Explore the properties of three dimensional shapes when you discover how six friends can equally divide a nine inch square chocolate cake. A one page activity from...
National Council of Teachers of Mathematics
Nctm: Figure This: Fire Hydrant
Discover how the geometric shape of an object directly relates to its usefullness in this math challenge from the NCTM Math Challenges for Families collection. A one page activity that you can print or download.
National Council of Teachers of Mathematics
Nctm: Figure This: Windshield Wipers
Test your mathematical aptitude with challenge exploring the concepts of measurement and geometry. Find the area of the windshield wipers to figure out who sees better in the rain, car drivers or truck drivers. An activity from the NCTM...
National Council of Teachers of Mathematics
The Math Forum: Vectors
This site from the Math Forum of Drexel University contains downloadable sketches and pictures related to vectors. You may need to down-load the Geometer's Sketchpad to view these pages.
National Council of Teachers of Mathematics
The Math Forum: Nctm: Ask Dr. Math: Graphing Scatter Plots
This page is in response to a question that someone emailed Dr. Math. It shows how to make a scatter plot for peoples' height and shoe sizes. The information is somewhat brief, but worth checking out on the subject.
National Council of Teachers of Mathematics
The Math Forum: Nctm: Ask Dr. Math: Correlation of a Scatterplot
This page from Ask Dr. Math describes the correlation of a scatterplot and gives an example of one with no correlation.
National Council of Teachers of Mathematics
The Math Forum: Vector Subtraction
Illustration and description of vector subtraction. Similar to vector addition.
National Council of Teachers of Mathematics
The Math Forum: Mass vs. Weight
This site gives an explanation that distinguishes mass from weight. It distinguishes between the two types of mass (inertial and gravitational), and gives the equations for computing both.
National Council of Teachers of Mathematics
The Math Forum: Projection: Theory
Describes how to use dot products to project one vector onto another.
National Council of Teachers of Mathematics
The Math Forum: Equivalent Expressions and Equations
Dr. Math at the Math Forum explains the difference between equivalent expressions and equivalent equations.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Hyperbolic Functions
In responding to a student question, Dr. Math provides a brief overview of hyperbolic functions.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Compound Interest Rule of 70
This page gives a brief explanation on how to compute compound interest.
National Council of Teachers of Mathematics
The Math Forum: Credit Card Calculations
At this site Dr. Math answers a question about credit card balance payoffs. An advanced algebraic solution is offered.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Stellated Dodecahedron
This question and answer site provides information about stellated dodecahedrons, as well as several internet links to this topic.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Volume of a Rectangular Solid
This question and answer site covers lateral area, total area, and volume of a rectangular solid.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Volume of a Cone
This question and answer site poses a problem dealing with the volume of a partly filled cone.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Area, Volume of a Cone
This question and answer site gives the formulas for area and volume of a cone.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Apothem of a Hexagon
This Q & A forum has a question answered on how to find the apothem of a hexagon.
National Council of Teachers of Mathematics
The Math Forum: Drexel University Math Forum: Imaginary Numbers
Contains a short summary on imaginary numbers and several links to its related fields. Also provides several examples and explanations for understanding.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: De Moivre's Theorem Proof
This Math Forum site contains a brief proof of De Moivre's Theorem ((cos(x)+isin(x))^n = cos(nx) + isin(nx)) Where n is an integer.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Congruence and Triangles
This site gives a very thorough explanation of how to tell if two triangles are congruent. Dr. Math explains why SSS, SAS, ASA determine that two triangles are congruent. The Dr. gives a few exercises for the reader to try then gives the...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Determining if a Function Is Even or Odd
Dr. Math responds to a question about determining whether a function is even or odd. The Dr. explains the process and then does one example.
National Council of Teachers of Mathematics
The Math Forum: K 12 Math Puzzles
This site from the Math Forum of Drexel University provides a selection of math puzzles for grades K through 12 are found here. Types include: taking the numbers in the year 2004 and arriving at the numbers 1 through 100, using four 4s...
National Council of Teachers of Mathematics
The Math Forum: The Cereal Box Problem
A cereal company is offering six different prizes in their boxes. How many boxes would you expect to have to purchase in order to collect all six prizes? Known as the Cereal Box Problem, this question is explored here. A solution is...