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.
Other
Math Stories: Finding a Pattern
At this one page site, you can work through step by step a sample problem that illustrates the problem-solving strategy for "identify a pattern." The answer is right there to help you check your thinking.