This Writing Task 5.OA.2: Expressions worksheet also includes:
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Can a half-page learning exercise can be a great lead-in activity? Yes, if its used to assess prior knowledge of word problems with an unknown variable n. Fifth graders are asked to produce an expression for a multiplication word problem and explain why their answer is correct. There is not a formal lesson plan, but it can be used in many configurations including small group work, guided practice, check-in for understanding or math journal entry.