Lesson 11 Different Ways to Add and Subtract
Let’s add and subtract by using a ten.
Warm-up Number Talk: Use Tens
Find the value of each expression mentally.
Activity 1 Compare Methods
Diego and Tyler found the value of
Diego’s Method:
Tyler’s Method:
Use Diego’s method to find the value of
. Use Tyler’s method to find the value of
.
Activity 2 More Methods
Partner A
Find the value of
. Find the value of
.
Partner B
Find the value of
. Find the value of
.
Practice Problem
Problem 1
Find the value of
Method 1:
Method 2:
