# 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.