National Council of Teachers of Mathematics
The Math Forum: Lattice Multiplication
Great web site that offers a detailed summary of how to multiply using the lattice multiplication method.
National Council of Teachers of Mathematics
Nctm: Illuminations: Circle Grapher
A computer applet that will draw any circle graph with student's data input.
National Council of Teachers of Mathematics
Nctm: Figure This: Tan, Don't Burn
How about a math challenge for a sunny day at the beach? Apply your problem solving, number sense, and logical reasoning skills to find out how long it would take Helix to get sunburned using SPF 10 lotion. Discover why understanding...
National Council of Teachers of Mathematics
Nctm: Figure This: Matching Birth Months
Here's a interesting challenge! Out of six people in a room, what is the probability that everyone was born in a different month? An investigation that explores the probability of an event occurring. Discover how this skill is used in...
National Council of Teachers of Mathematics
Nctm: Figure This: Keeping Cool
Is it better to by block ice or crushed ice? Use your logical reasoning and measurement skills to solve this challenge that compares surface area of block ice and the same block cut into three cubes. A one page activity from the NCTM...
National Council of Teachers of Mathematics
Nctm: Figure This: Envelopes
Explore tessellations with real world applications in this activity from the NCTM Math Challenges for Families series. Figure out what shape you would use to create a legal envelope from a single sheet of paper. Then discover how...
National Council of Teachers of Mathematics
Nctm: Figure This: Drip Drops
Figure out how much water you waste in a week in this exploration using your problem solving, measurement, and estimation skills. This activity is from the NCTM Math Challenges for Families series.
National Council of Teachers of Mathematics
Nctm: Figure This: How Many Fish in the Pond?
Can you figure out how many fish are in a pond? Use the statistical method of capture-recapture and estimation to solve this math challenge. An investigation from the NCTM Math Challenges for Families series. Discover how this skill can...
National Council of Teachers of Mathematics
Nctm: Figure This: Animal Ages
An investigation for the animal lovers that focuses on measurement conversion, data analysis, and calculating growth rates.
National Council of Teachers of Mathematics
Nctm: Figure This: What's Missing?
Can you find the missing pattern in the "sona?" Explore missing patterns and growing patterns in this NCTM Math Challenges for Families activity. Discover how archaeologist and anthropologist use these mathematical patterns to learn...
National Council of Teachers of Mathematics
Nctm: Figure This: How Much Time Do Teens Spend on the Job?
Try this math challenge where you investigate the average number of hours teen actually spend working. Apply your problem solving, number sense, and computation skills in this one page activity from the NCTM Math Challenges for Families...
National Council of Teachers of Mathematics
Nctm: Figure This: What Time Is It In?
Can you figure this? If it is afternoon in San Francisco, California, what time is it in Cairo, Egypt? Explore positive and negative number values in this one page activity using time zones from different parts of the world.
National Council of Teachers of Mathematics
Nctm: Figure This: Nctm Math Challenge Three Squares (Pdf)
If you think you can handle the Pythagorean Theorem, then this is a math challenge you should try. Explore geometric relationships and measurement in this one page activity from the NCTM Math Challenges for Families series.
National Council of Teachers of Mathematics
Nctm: Figure This: Table for 19 (Pdf)
The waiters at Polygon's Restaurant need your help. See if you can use your problem solving and patterning skills to help them solve this math challenge. Discover how developing these skills could be useful in real life situations, in...
National Council of Teachers of Mathematics
Nctm: Figure This: Rose Bowl
A math challenge taken directly from the sports pages. Use your problem solving and data collection aptitude to find out how many different ways a Rose Bowl team could score 11 points. Try this one page activity from the NCTM Math...
National Council of Teachers of Mathematics
Nctm: Figure This: Radar Bills
Have you seen a radar bill lately? Explore number patterns, number combinations, and probability in this math challenge that examines serial numbers on U.S. bills. A one page activity from the NCTM Math Challenges for Families series.
National Council of Teachers of Mathematics
Nctm: Figure This: Patios
Does bigger perimeter mean bigger area? Answer this question when you try this math challenge from the NCTM Math Challenges for Families series. Discover how understanding area and perimeter can be useful in real world situations.
National Council of Teachers of Mathematics
Nctm: Figure This: Monday's Child
Do you know what day of the week were you born? You can find the exact day when you try this math challenge that explores problem solving with algorithms. Find out how scientist and statisticians use algorithms in their jobs. A one page...
National Council of Teachers of Mathematics
Nctm: Figure This: How Many Colors of States Are on a Us Map
Try this data collection and analysis math challenge on map coloring. An interesting approach to analyzing complex data. This one page activity is part of the NCTM Math Challenges for Families collection.
National Council of Teachers of Mathematics
Nctm: Figure This: Majority Vote
Cast your vote for this math challenge that explores calculating percentages as it relates to voting. Discover how mastering this skill will be beneficial in real life situations. A one page activity from the NCTM Math Challenges for...
National Council of Teachers of Mathematics
Nctm: Figure This: Pigeonhole Principle
What is the possibility that another student in your school will have your exact same initials? Try this math challenge using logical reasoning and the "Pigeonhole principle," to discover how this could actually happen. An engaging...
National Council of Teachers of Mathematics
Nctm: Figure This: Grape Juice Jungle
Are all juice grape juice concentrates the same? Find out when you explore ratio and fractions in this math challenge that compares juice recipes to identify strongest taste. A one page activity from the NCTM Math Challenges for Families...
National Council of Teachers of Mathematics
The Math Forum: Unit Vectors and Unit Circle
Description of the unit vector and its relationship to the unit circle.
National Council of Teachers of Mathematics
The Math Forum: Vector Addition: Geometry
Illustrates and describes how to add two vectors graphically.