# Lesson 12 Compare Multi-digit Numbers

• Let’s compare large numbers.

## Warm-up Which One Doesn’t Belong: Friendly Numbers

Which one doesn’t belong?

1. 1,395

2. 3,095

3. 9,530

4. 30,195

## Activity 1 Which is Greater?

Your teacher will give you a set of cards, each with a single digit, 0–9.

## Problem 1

Use the cards for 2, 7, and 8 to make two different three-digit numbers. Use < or > to compare them.

## Problem 2

Now include the digit 1 to make two different four-digit numbers. Compare the numbers.

## Problem 3

Shuffle the cards. Repeat what you did earlier with new cards.

1. Four-digit numbers

2. Five-digit numbers

3. Six-digit numbers

## Problem 4

For each pair you compared, how did you decide which number is greater?

## Problem 1

Here are two numbers. In both, the missing digit is the same number.

• Han says the numbers can’t be compared because they are incomplete.

• Clare says the second number is greater, no matter what the missing digit is.

Do you agree with either one of them? Explain your reasoning.

## Problem 2

Here are some pairs of numbers. The numbers in each pair are missing the same digit. Can you tell which number is greater? Be prepared to explain your reasoning.

## Activity 3 Is It Possible?

1. Each of the following pairs of numbers is missing the same digit but in different places.

Your teacher will assign a digit to you. Use it as the missing digit and decide if each comparison statement is true.

2. Here are two numbers, each with the same missing digit.

Choose a digit to complete the numbers and show where they would be on the number line.