# Lesson 5 Explore Addition and Subtraction

Let’s add and subtract.

## Warm-up Number Talk: Subtract 1 or 2

Find the value of each expression mentally.

## Activity 1 Introduce Check it Off: Subtract within 10

We are going to learn a new way to play Check it Off. This time, instead of adding to find each number on the recording sheet, you will subtract.

## Activity 2 Centers: Choice Time

Choose a center.

Counting Collections

Number Race

Check it Off

Five in a Row: Addition and Subtraction

## Practice Problem

## Problem 1

Show 2 ways you could use these cards in the game.