Lesson 27 Center Day 4
Let’s play games to practice addition and subtraction.
Warm-up Number Talk: Subtract 10
Find the value of each expression mentally.
Activity 1 Introduce How Close? Subtract from 20
We are going to learn a new way to play the How Close center. Let’s play one round together.
Activity 2 Introduce Compare: Add and Subtract Within 20
Choose a center.
Compare
![Center. Compare.](../../../../../downloads/05a182f6--Compare_Full-copy.png)
Five in a Row
![Center activity. Five in a row.](../../../../../downloads/f291116a--1.5.B-Centers.5_in_a_row-(1).png)
How Close?