National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Graphing a Parabola
Dr. Math helps a student interpret the equation of a parabola so that the student understands how each part of the equation effects the graph.
National Council of Teachers of Mathematics
The Math Forum: Quadratic Formulas, Equations, Parabolas
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.
National Council of Teachers of Mathematics
The Math Forum: Interest Rates
This Dr. Math site asks about simple interest and its effect on the repayment of a loan.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Cone Symmetry
This question and answer site examines why a circular cone has an infinite number of lines of symmetry.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Surface Area of a Cylinder
This question and answer site reviews the formula of finding the surface area of a cylinder.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Area of a Pentagonal Pyramid
This question and answer site reviews finding both the area and volume of a pentagonal pyramid.
National Council of Teachers of Mathematics
The Math Forum: The Volume of a Pyramid
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.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Dividing and Multiplying Radicals
Site describes how one would multiply and divide radicals and simplify the final result by using examples.
National Council of Teachers of Mathematics
The Math Forum: Adding Radicals
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.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Why Repeating Decimals Are Rational?
Math Forum response to why all repeating decimals are rational numbers, including examples and concise explanations.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Distributive Property Illustrated
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...
National Council of Teachers of Mathematics
The Math Forum: Means Proportional and Geometric Means
Dr. Math helps a student discover the meaning of the mean proportional of two numbers. Detailed explanation with examples.
National Council of Teachers of Mathematics
The Math Forum: Teacher 2 Teacher: Use of Calculator Discussion Room
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.
National Council of Teachers of Mathematics
The Math Forum: How Do You Find Prime Numbers?
This site explains prime number theory and how to find prime numbers.
National Council of Teachers of Mathematics
The Math Forum: Odds and Probability
Odds and probability are related, but not the same thing. This question and answer site clears up the difference between the two.
National Council of Teachers of Mathematics
The Math Forum: Understanding Algebraic Factoring
This site from the Drexel University explains the principles of factoring symbolically using algebra tiles.
National Council of Teachers of Mathematics
The Math Forum: The Four Basic Symmetries
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.
National Council of Teachers of Mathematics
The Math Forum: Understanding Standard Deviation
MathForum answers a question on variance and standard deviation.
National Council of Teachers of Mathematics
The Math Forum: Against the Odds Lesson Plan
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.
National Council of Teachers of Mathematics
The Math Forum: Height to Weight Ratio
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.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: About "E"
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...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Triangle Altitudes
Here at the Math Forum, Dr. Math proves the concurrency of the altitudes of a triangle. Links are provided for associated topics.
National Council of Teachers of Mathematics
The Math Forum: Foci of an Ellipse
The question, "If the major and minor axis of an ellipse are given, how do I find the focus points?" is answered at the Math Forum.
National Council of Teachers of Mathematics
The Math Forum: Markdown Savings
This site from the Drexel University contains problems for practicing using percents, using a mock sale as the motif. A link takes you to a model solution.