1. How do you find the difference between three-digit numbers without drawing out any pictures? 578 - 321= ?

2. In this lesson you will learn how to add three-digit numbers by using expanded form.

3. Let’s Review Expanded form of a number: 2 2 2 200+20 +2

4. A Common Misunderstanding Some people add the numbers they see, not their values. 2 2 2 2+2 +2

5. Core Lesson What is 869 - 341 ? 800 60 9 500 20 8 + + 528 - 40 - 1 - 300

6. Core Lesson 500 70 8 - 300 What is 578 - 321? 200 50 7 + + 257 578 - 321= ? - 20 - 1

7. Core Lesson What is 758 - 606 ? 700 50 8 100 50 2 + + 152 - 0 - 6 - 600

8. In this lesson you have learned to add three-digit numbers by using expanded form.