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CK-12 Foundation
Ck 12: Elem Math: Describing Patterns Using Letters
[Free Registration/Login may be required to access all resource tools.] Students watch a video and attempt practice problems on dexcribing and extending a pattern.
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.