## Lesson: Modeling Addition

Developing the Concept

Once children have had practice joining groups with sums to 6, you can introduce the Zero Property and the Commutative Property, and writing addition sentences vertically. Finally, introduce sums to 7 and 8 and then focus on different ways to make a number, up to 8.

**Materials:** overhead projector, 8 overhead counters, blank overhead transparency; Workmat 2 (Two-Part Mat in the student book), 8 counters, and Ways to Make (PDF file) worksheets for each child; Race to the Sum (PDF file) game board, spinner (0–3), number cubes (1–5) for every 2 children

**Preparation:** Be prepared to give each child 8 counters and a copy of Workmat 2 during the lesson. Prepare Ways to Make (PDF file) worksheets for each child. Make copies of Race to the Sum (PDF file) game boards and spinners with the numbers from 0 to 3 for each pair of children.

**Prerequisite Skills and Concepts:** Children should be proficient in counting and recognizing numbers to 10. They should also demonstrate a good understanding of joining groups with sums to 6.

**Wrap-Up and Assessment Hints:**

You can assign to each child or pair of children a number or set of numbers and have them model and write all the ways to make that number. You can assess children's understanding of addition by observing them as they play Race to the Sum. This game will assess their ability to add numbers to 8. You may wish to have children record their addition sentences as they play.