Lesson 4 More Work with 1 and 2
Let’s subtract 1 or 2.
Warm-up Number Talk: Add 1 or 2
![Student thinking.](../../../../../downloads/18024309--Grade4.Unit4.Lesson15.Activity3.png)
Find the value of each expression mentally.
Activity 1 Introduce Five in a Row: Addition and Subtraction, Subtract 1 or 2
We are going to learn a new way to play, Five in a Row.
Activity 2 Centers: Choice Time
Choose a center.
Counting Collections
Number Race
![Center. Counting Collections.](../../../../../downloads/3de1e05f--counting-collections-illustration.png)
![Center. Number Race.](../../../../../downloads/7d4261a4--Number-Race.png)
Check it Off
Five in a Row: Addition and Subtraction
![Center. Check It Off.](../../../../../downloads/35043c4d--Check-it-off.png)
![Center activity. Five in a row.](../../../../../downloads/f291116a--1.5.B-Centers.5_in_a_row-(1).png)
Practice Problem
Problem 1
Find the value of each difference.