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.