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

Bucket of base-ten blocks.

  1. Sort the blocks.

    • We have hundreds.

    • We have tens.

    • We have ones.

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

    • We have hundreds.

    • We have tens.

    • We have ones.

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

Activity 2 The Same But Different

Problem 1

Mai’s Blocks

Base-ten blocks. 1 hundred, 7 tens, 18 ones.

  1. Mai has hundreds tens

    ones.

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

  3. What is the value of Mai’s blocks?

Problem 2

Diego’s Blocks

Base-ten blocks.

  1. Diego has hundreds tens

    ones.

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

  3. What is the value of Diego’s blocks?

Practice Problem

Problem 1

Here is a base-ten diagram.

Base-ten diagram. 1 hundred. 3 tens. 14 ones.

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

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

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