Lesson 13 Center Day 3
Let’s add 2 two-digit numbers.
Warm-up Choral Count: Count Back from 100
Count backward by 1, starting at 100.
What patterns do you see?
Activity 1 Introduce Target Numbers: Add Two-Digit Numbers
Choose a center.
Target Numbers
![Center. Target Numbers.](../../../../../downloads/dbe40ddc--TargetNumbers.png)
Number Puzzles
Mystery Number
![Center activity. Mystery Number.](../../../../../downloads/df0a291a--MysteryNumbers.png)
Activity 2 Introduce Five in a Row: Add within 100 with Composing
Choose a center.
Five in a Row
![Center activity. Five in a row.](../../../../../downloads/f291116a--1.5.B-Centers.5_in_a_row-(1).png)
Get Your Numbers in Order
![Center activity. Get Your Numbers In Order.](../../../../../downloads/c2674632--GetYourNumbersInOrder.png)
Grab and Count
![Center. Grab and Count.](../../../../../downloads/831f4860--GrabAndCount.png)