Lesson plan

2. Multiplying larger numbers with arrays and base ten blocks (FP)

teaches Common Core State Standards CCSS.Math.Content.4.NBT.B.5 http://corestandards.org/Math/Content/4/NBT/B/5
teaches Common Core State Standards CCSS.Math.Content.4.OA.A.3 http://corestandards.org/Math/Content/4/OA/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Multiply using place value representations. 

This lesson helps to build fluency with one- by three-digit multiplication. Arrays and area models are used here because they support place value decomposition for efficiency. This work develops students' understanding that the distributive property and decomposition can be used to solve multiplication problems.

Students engage in Mathematical Practice 7 (Look for and make sense of structure) as they use place value decompostion to create arrays and area models to solve multiplication problems. 

Key vocabulary:

  • array
  • base ten block
  • cube
  • decomposition
  • flat
  • place value
  • rod

Special materials needed:

  • base ten blocks