National Council of Teachers of Mathematics
The Math Forum: Investigating the Golden Ratio
This site gives a diagram of a golden rectangle, the value for the golden ratio, and a few problems for students to work relating to the golden ratio. This site does not however explain the significance of this ratio.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Babylonian Number System
Dr. Math takes on a question about the Babylonian base-60 math system, explaining how a sexagesimal system looks and works in comparison with our decimal (base 10) system.
National Council of Teachers of Mathematics
The Math Forum: Seventh Grade Mathematics: Cycles
Teachers can use this resource for creating interesting lessons about time and time measurement. There are articles about leap year, converting time, as well as other links for further research. An interdisciplinary project about an...
National Council of Teachers of Mathematics
The Math Forum: Seventh Grade Mathematics: Data Sense
This site has some interesting ways to collect and evaluate data. There are some activities about note taking, spreadsheets, surveys, and a cool bridge construction project. Teachers may want to use this site as a resource for some...
National Council of Teachers of Mathematics
The Math Forum: Seventh Grade Math: Area and Perimeter
Learn how to enlarge drawings, figure out how much tile to buy to cover a specific floor, and learn about area and perimeter. These and other lesson plans are provided, including a fun interdisciplinary plan featuring dragons.
National Council of Teachers of Mathematics
The Math Forum: A Tour of Measurement
Peruse a collection of lesson plans, resources and FAQ's about measurement at every grade level.
National Council of Teachers of Mathematics
The Math Forum: A Collection of Secondary Math Units
Teachers of grades 9-12 can explore these seven math units for their classes. Data collection and analysis, problem solving with spreadsheets, and linear transformation are just a few of the topics covered here.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Binomial Expansions and Pascal's Triangle
This site answers a student's question inquiring about the definition of a binomial expansion, where it would be used, and why.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Formal Definition of a Limit
This Math Forum site is an inquiry by a student about the definition of a limit with a response by a professor. If you are confused by the student's inquiry don't worry, take a look at the doctor's response which explains what a limit is...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Two Column Proofs
A response to an inquiry of how to prove a two column geometric proof problem at the Math Forum. This site gives a description of what a makes a proof and an example of a two column proof.
National Council of Teachers of Mathematics
The Math Forum: Prime Numbers
Explains what Prime Numbers are and how to find them. Includes a list of primes under 200 and discusses the Sieve of Eratosthenes. This site has numerous links to other internet sources regarding prime numbers.
National Council of Teachers of Mathematics
The Math Forum: Inequalities and Absolute Value Case Method
"Dr. Math" responds to a student question on how to use the case method in solving absolute value ienqualities.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Adding and Subtracting Inequaliites
"Dr. Math" provides an explanation on remembering when inequalities may be added and subtracted. The explanation is in response to a question submitted by a student.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Interval Notation
"Dr. Math" provides an explanation on how to express the solution of a conjunction inequality using interval notation.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Fraction Basics
Gives a very basic overview of fractions and their parts. Discusses adding, multiplying, and finding a common denominator.
National Council of Teachers of Mathematics
The Math Forum: Why Does 0! = 1?
Dr. Math describes the reasoning behind 0! = 1.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Age Word Problems
Dr. Math walks you through the necessary steps to solve age problems. Additional examples are included.
National Council of Teachers of Mathematics
The Math Forum: The Birthday Problem
Dr. Math demonstrates how the birthday problem - what are the odds that two people in a room have the same birthday - works. Several links are available for extended investigations of the problem.
National Council of Teachers of Mathematics
The Math Forum: Drexel University: Boy or Girl?
Dr. Math explores the probability of the children in families being boys or girls. A look at the mathematics involved in each situation is included.
National Council of Teachers of Mathematics
The Math Forum: Geometer's Sketch Pad: An Introductory Lesson
This site is a five part tutorial to get started using Geometer's Sketch Pad. The tutorial goes through things such as setting up to install GSP, the tool box, other functions, graphing,and more.
National Council of Teachers of Mathematics
The Math Forum: Pi Day
Need some ideas for Pi Day on March 14th? You can get some great resources at this location. There are all kinds of links available.
National Council of Teachers of Mathematics
The Math Forum: Calculation Tips & Tricks: Multiplication Tips
Find tips for multiplying by 5, 9, and 11, and learn how to solve math problems without a calculator. This site includes explanations and examples for gifted children and teachers wanting to challenge their students.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Building Two Column Proofs
Use this site to find details of how to construct a two column proof. Dr. Math responds to a question posed by a student and details the reasons for the order of steps and shows two different ways to do the same proof.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Order of a Proof
The site gives a diagram of steps to a proof. Dr. Math explains why the step order of a proof is important.