## Lesson: Modeling Division

Introducing the Concept

Begin the lesson by reviewing basic multiplication facts and parts of a group. See Addition and Subtraction Facts to 20 and Geometry and Fractions. Encourage children to share their thinking as they work through the examples in the lesson. This will allow you to connect what children have already learned to what they are learning in this chapter.

**Materials:** large sheet of construction paper; 5 containers such as dishpans or boxes; at least 20 countable objects such as pencils, books, crayons, cups, and juice cartons, or manipulatives such as counters or blocks

**Preparation:** Use a red marker to write *Left Over* in large letters at the top of a sheet of construction paper.

**Prerequisite Skills and Concepts:** Children should know the addition and subtraction facts to 20.