Lesson 8 Compose Tens and Hundreds to Add
Let’s compose tens and hundreds to add.
Warm-up How Many Do You See: Too Many Tens
How many do you see? How do you see them?
Activity 1 Compare the Sums
Find the value of each sum. Show your thinking. Use base-ten blocks if it helps.
What was the same and different about the sums?
Activity 2 Different Ways to Show Your Thinking
Priya and Lin were asked to find the value of
. Priya’s work
Lin’s work
What do you notice about their work? What is the same and different about their representations? Be prepared to explain your thinking.
Find the value of
. Show your thinking. Use base-ten blocks if it helps.
Practice Problem
Problem 1
Find the value of each sum. Show your thinking.