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Common Core Sheets
Common Core Sheets: Operations and Algebraic Thinking 5.oa.3 Worksheets
Teachers can assess students' knowledge of analyzing patterns and relationships with these printable worksheets. You can even create your own worksheet or flashcards.
PBS
Pbs Mathline: Bead Dazzling (Proportional Reasoning) [Pdf]
A comprehensive lesson on algebraic thinking where students create and identify patterns using proportional reasoning. Research based, this lesson includes technology connections, items for discussion, and extension activities.