Lesson objective: Multiply multi-digit numbers using arrays and area models.

This lesson helps to build fluency with multiplying multi-digit numbers. Arrays and area models are used here because they allow for place value decomposition and clearly represent the multiplcation taking place. This work develops students' understanding that place value and the distributive property can decompose the numbers and make multiplying more efficient.

Students engage in Mathematical Practice 7 (Look for and make use of structure ) as they use our place value system to decompose and multiply numbers with arrays and area models.

**Key vocabulary:**

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

**Special materials needed:**

- base ten blocks