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National Institutes of Health
National Institute of Environmental Health Services: Brainteasers: Palindromes
This resource provides an interactive game, word lists and phrase lists all about palindromes.
Mathigon
Mathigon: Geometry: Symmetry
This lesson focuses on symmetry including reflectional symmetry, rotational symmetry, and palindromes. It defines each, gives examples, and practice activities.
Other
Rhl School: Math Problem Solving
Utilize this site for lesson plans and worksheets to help your students with math problem-solving.
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
Bob's Byway: Glossary of Poetic Terms
Calling itself "unique," Bob's is easy to use, with cross-links throughout, phonetic pronunciation guides when necessary, and many examples and quotations. Click on the letter and scroll for the word.