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.

$20 - 10$
$20 - 10 - 1$
$18 - 10 - 4$
$18 - 14$

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.

Five in a Row

Center activity. Five in a row.

How Close?