Distributive property
Target: Multiply a factor through every term in a sum.
Language target: Say “both terms.”
Likely miss: Students multiply the coefficient only by the variable.
Ask: What happened to the second term?
If you see it: Draw an area rectangle split into two parts before writing the sum.
Evidence to listen for: Both terms of the sum show the factor.
Next: If a term is left behind, return to the area model.
Observable student moves: names both quantities, uses the represented relationship, and revises after feedback. This companion is not a score.
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