# Lesson 3 Compose Three-digit Numbers

Let’s compose three-digit numbers.

## Warm-up Number Talk: Add Tens and Ones

Find the value of each expression mentally.

## Activity 1 Sort Blocks by Value

Sort the blocks.

We have hundreds.

We have tens.

We have ones.

Represent the same value with the fewest number of blocks possible.

We have hundreds.

We have tens.

We have ones.

Represent the value of your blocks using base-ten diagrams, words, or numbers.

## Activity 2 The Same But Different

## Problem 1

Mai’s Blocks

Mai has hundreds tens

ones.

Draw a base-ten diagram to represent the same total value with the fewest number of each unit.

What is the value of Mai’s blocks?

## Problem 2

Diego’s Blocks

Diego has hundreds tens

ones.

Draw a base-ten diagram to represent the same total value with the fewest number of each unit.

What is the value of Diego’s blocks?

## Practice Problem

## Problem 1

Here is a base-ten diagram.

Draw another base-ten diagram to represent the same total value with the fewest number of each unit.

Write the number represented by the diagram as a three-digit number.

Can you make the same number with more base-ten blocks? Show your thinking using drawings, numbers or words.