# Section C: Practice Problems Subtract Within 1,000 using Place Value Strategies

## Section Summary

## Details

In this section of the unit, we learned many different ways to subtract three-digit numbers using what we know about place value. We used base-ten blocks, diagrams, and equations to show subtracting hundreds from hundreds, tens from tens, and ones from ones. We learned that when you subtract by place, you may decompose a hundred, a ten, or both. We learned that it is helpful to look closely at the numbers in an expression to plan how to decompose or to choose a method that helps us use friendly numbers or the relationship between addition and subtraction.

Base-ten Diagram for

Unit Form for

## Problem 1 (Lesson 12)

Find the value of each difference.

Jada drew this picture to find the value of a difference. What difference did Jada calculate? Explain how you know.

## Problem 2 (Lesson 13)

Find the value of each difference. Show your thinking.

## Problem 3 (Lesson 14)

Jada is finding the value of

## Problem 4 (Lesson 15)

Find the value of each difference. Show your thinking.

## Problem 5 (Lesson 16)

Find the value of each difference in a way that makes sense to you. Show your thinking.

## Problem 6 (Exploration)

Here is how Kiran found the value of

Explain why Kiran’s method works.

Use Kiran’s method to find

## Problem 7 (Exploration)

Choose a three-digit number so that subtracting by place value is a good strategy for finding the value of

. Explain your reasoning and find the value of the difference. Choose a three-digit number so that adding on to the smaller number is a good strategy for finding the value of

. Explain your reasoning and find the value of the difference. Choose a three-digit number so that decomposing two different units is a good strategy for finding the value of

. Explain your reasoning and find the value of the difference.