Expanding Numbers to Add or Subtract: Using Expanded Form

This lesson teaches how to add or subtract 10 or 100 to a number using expanded form. It begins with an introduction to expanded form, explaining how to break down numbers into their individual place values. The lesson provides examples of subtracting 10 from 375 and adding 100 to 631, demonstrating the process of expanding numbers and then recombining them to find the result. By the end, students will understand how to manipulate numbers using expanded form for addition and subtraction.

What is the expanded form of the number 222?

Explain why you cannot simply add the digits of a number when using expanded form.

How do you find the answer to the number sentence 375 - 10 using expanded form?

Describe the process of converting expanded form back to standard form.

What is the result of 631 + 100 when using expanded form?