Lesson plan

Multiply 2-digit by 1 or 2-digit whole numbers using rectangular arrays

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teaches Common Core State Standards 4.NBT.B.5 http://corestandards.org/Math/Content/4/NBT/B/5
teaches Common Core State Standards 4.OA.A.3 http://corestandards.org/Math/Content/4/OA/A/3
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Big Ideas: Compose and decompose base-10 units. Use place value understanding and properties of operations to perform multi-digit arithmetic visual representations. Students use rectangular arrays to multiply 2-digit by 1-digit and 2-digit by 2-digit whole numbers. Students develop, discuss, and use efficient, accurate, and generalization methods to compute products of multi-digit whole numbers. They apply their understanding of models for multiplication (equal-sized groups, arrays), place value, properties of operations, and the distributive property. Vocabulary: factor pairs, multiples, equation, rectangular array Special Materials: graph paper, optional base-10 blocks, optional