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?

• 2 + 2 + 2

• 220 + 2

• 200 + 20 + 2

• 200 + 2 + 20

When subtracting 10 from 375, which digit's value is affected?

• Ones place

• Tens place

• Hundreds place

• All places

After subtracting 10 from 375, what is the resulting number?

• 355

• 385

• 375

• 365

In the expanded form of 631, which place value increases when adding 100?

• Ones place

• Tens place

• Hundreds place

• Thousands place

What is the result of adding 100 to 631?

• 630

• 7310

• 641

• 731