Adding Numbers Using an Open Number Line

This video tutorial teaches how to add multi-digit whole numbers using an open number line. It begins with a review of expanded form, breaking down numbers into their place values. The tutorial then demonstrates the addition process with two examples, showing how to make jumps on the number line by adding parts of the expanded form. The video emphasizes understanding place value changes during addition.

Describe the importance of using expanded form when adding multi-digit numbers.

What steps do you take to add 90 to the number 57,621?

What is the final answer when adding 42,321 and 15,397?