Sometimes when you add, you have to regroup, or carry, a group of tens. That is why you need to line up your math problems like a pro. Learn more about addition and regrouping with this step-by-step, interactive link from StudyJams. A short, self-...checking quiz is also included.[more]

The instructor discusses how to recognize when addition, as opposed to other mathematical operations, is the appropriate approach for solving a problem. From the pre-algebra course by Derek Owens. (04:01)

This video teaches students to add two-digit numbers using mental math and left to right addition ( two column addition). The problems appear on a white screen and are explained step-by-step by a math tutor. By the end of the video, students learn t...o add four two-digit numbers. (09:39)[more]

In this video, the instructor uses software to review how to add numbers. He starts with single-digit numbers, then moves into two-digit numbers, and reviews how to use a number line. (12:26)

Using tens and ones blocks to model the numbers, students will add a 1-digit number to a 2-digit number. Begin by adding the ones together, then the tens. The user clicks through the slides.

This video demonstrates addition of three-digit numbers mentally with multiples of ten. The problem appears on a white screen, and the strategy is explained step-by-step as the problem is solved. ( 1:30)

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