# Lesson 2 Make Hundreds

Let’s represent hundreds in different ways.

## Warm-up Choral Count: Count by 10

Count by 10, starting at 0.

What patterns do you see?

## Activity 1 Make Hundreds

## Problem 1

Build each number using base-ten blocks. Record how many tens blocks you use.

Build 90.

tens

Build 110.

tens

Build 150.

tens

## Problem 2

How many base-ten blocks would you need to build 200?

tens

How many base-ten blocks would you need to build 300?

tens

How many base-ten blocks would you need to build 300 if you could use 1 hundreds block?

1 hundred tens

How many tens would you need to build 300 if you could use 2 hundreds blocks?

2 hundreds tens

How many tens would you need to build 300 if you could use only hundreds blocks?

hundreds tens

## Activity 2 How Many Hundreds?

Han and Jada represented the same number using base-ten blocks. They started base-ten diagrams, but ran out of time to finish them.

Jada

Han

I only used hundreds.

Total value: 700

I only used tens.

Total value: 700

Use base-ten blocks to show what each student’s work would look like if they had time to finish it.

Explain how you know both ways of using base-ten blocks show 700.

Complete Jada’s base-ten diagram.

Explain why you think Han ran out of time to finish his diagram.

## Practice Problem

## Problem 1

How many hundreds are the same as 50 tens? Explain your reasoning.

How many tens are the same as 6 hundreds? Explain your reasoning.