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Website
National Council of Teachers of Mathematics

The Math Forum: Quadratic Formulas, Equations, Parabolas

For Students 9th - 10th Standards
Dr. Math here at the Math Forum, in a reply to a student question, helps find the vertex and coordinates of the parabola. The information is somewhat brief, but factual, and worth checking out.
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Handout
National Council of Teachers of Mathematics

The Math Forum: Interest Rates

For Students 9th - 10th
This Dr. Math site asks about simple interest and its effect on the repayment of a loan.
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Unit Plan
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Cone Symmetry

For Students 9th - 10th
This question and answer site examines why a circular cone has an infinite number of lines of symmetry.
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Unit Plan
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Surface Area of a Cylinder

For Students 9th - 10th
This question and answer site reviews the formula of finding the surface area of a cylinder.
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Activity
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Area of a Pentagonal Pyramid

For Students 9th - 10th
This question and answer site reviews finding both the area and volume of a pentagonal pyramid.
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Activity
National Council of Teachers of Mathematics

The Math Forum: The Volume of a Pyramid

For Students 9th - 10th
This question and answer site from the Math Forum with Dr. Math presents a problem dealing with the volume of a pyramid. Links are also provided for additional information on related subjects.
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Handout
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Dividing and Multiplying Radicals

For Students 9th - 10th Standards
Site describes how one would multiply and divide radicals and simplify the final result by using examples.
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Handout
National Council of Teachers of Mathematics

The Math Forum: Adding Radicals

For Students 9th - 10th Standards
This site from the Math Forum with Dr. Math provides a brief but factual answer to a question posted about adding radicals. Dr. Math answers the question well, and in two paragraphs describes the subject.
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Activity
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Why Repeating Decimals Are Rational?

For Students 9th - 10th Standards
Math Forum response to why all repeating decimals are rational numbers, including examples and concise explanations.
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Handout
National Council of Teachers of Mathematics

The Math Forum: Nctm: Ask Dr. Math: Solving Inequalities

For Students 9th - 10th Standards
In response to a student question about solving an inequality, "Dr. Math" provides a general discussion of what is necessary to solve these types of problems.
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Activity
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Distributive Property Illustrated

For Students 6th - 8th Standards
This is part of a math forum at Drexel University. A student gets frustrated when asked to solve a problem using the distributive property. Never fear. Dr. Math to the rescue! Illustrations and detailed examples help provide...
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Website
National Council of Teachers of Mathematics

The Math Forum: Means Proportional and Geometric Means

For Students 9th - 10th Standards
Dr. Math helps a student discover the meaning of the mean proportional of two numbers. Detailed explanation with examples.
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Professional Doc
National Council of Teachers of Mathematics

The Math Forum: Teacher 2 Teacher: Use of Calculator Discussion Room

For Students 9th - 10th
This site is a discussion room where teachers have commented on the use of calculators in the classroom. If you're a teacher feel free to join in on the discussion or ask your own question regarding calculators.
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Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Random Drawing Tool

For Students 5th - 8th Standards
Students are able to to visualize the difference between theoretical and experimental probabilities with this computer based tool.
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Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Five Frame

For Students Pre-K - 1st Standards
Count the amounts given to find the total. Five different games are available to practice counting and combining amounts.
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Handout
National Council of Teachers of Mathematics

The Math Forum: How Do You Find Prime Numbers?

For Students 9th - 10th Standards
This site explains prime number theory and how to find prime numbers.
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Handout
National Council of Teachers of Mathematics

The Math Forum: Ratios and Fractions

For Students 3rd - 8th Standards
A seventh-grade student is having trouble understanding ratios, fractions, and simplest form. Dr. Math to the rescue! Real-world, easy to grasp examples.
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Handout
National Council of Teachers of Mathematics

The Math Forum: Odds and Probability

For Students 9th - 10th Standards
Odds and probability are related, but not the same thing. This question and answer site clears up the difference between the two.
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Activity
National Council of Teachers of Mathematics

The Math Forum: Understanding Algebraic Factoring

For Students 9th - 10th
This site from the Drexel University explains the principles of factoring symbolically using algebra tiles.
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Activity
National Council of Teachers of Mathematics

The Math Forum: The Four Basic Symmetries

For Students 9th - 10th Standards
This is a site from the Math Forum that gives visual examples to show the differences between the four different kinds of symmetry. Examples are given along with links to additional information.
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Handout
National Council of Teachers of Mathematics

The Math Forum: Understanding Standard Deviation

For Students 9th - 10th Standards
MathForum answers a question on variance and standard deviation.
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Lesson Plan
National Council of Teachers of Mathematics

The Math Forum: Against the Odds Lesson Plan

For Teachers 3rd - 8th Standards
Teachers can find ideas for their probability lesson plans here. For example, there is an interdisciplinary unit dealing with disabilities and probability as well as one using a field trip to Sea World.
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Website
National Council of Teachers of Mathematics

The Math Forum: Height to Weight Ratio

For Students 3rd - 8th Standards
A student asks Dr. Math, "If I have a friend that weighs 155 pounds and is five feet, four inches tall, what is his height-to-weight ratio?" Find out how Dr. Math solves this problem and get a better understanding of the concept of ratio.
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Activity
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: About "E"

For Students 9th - 10th
This site gives a discussion about e, the base of the natural logarithm. The site contains history of this real number a discussion on the rationality of the number and how to approximate the value of e. The site contains numerous links...