# Lesson 8 Add and Subtract Within 100

• Let’s fluently add and subtract within 100.

## Warm-up Number Talk: Add by Place

Find the value of each expression mentally.

## Activity 1 Heads Up, Add and Subtract Within 100

Write an equation that shows the value you found for each round you play.

Round 1:

Round 2:

Round 3:

Choose a center.

Five in a Row

Target Numbers