Lesson 17 Center Day 3

- Let’s add and subtract 3-digit numbers.

Warm-up Number Talk: Simplify It

Find the value of each expression mentally.

$34 - 9$
$434 - 99$
$367 - 98$
$635 - 298$

Activity 1 Introduce Target Numbers, Add Hundreds, Tens, or Ones

We are going to learn a new way to play the Target Numbers center.

Activity 2 More Target Numbers and Choice Time

Choose a center.

Target Numbers

Center. Target Numbers.

Five in a Row: Addition and Subtraction

Center activity. Five in a row.

How Close?