Lesson 102a: Subtracting Signed Numbers

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Added on 3/4/2010 by MathWithLarry Tutorials

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In this lesson you'll learn how to subtract signed numbers. Subtracting signed numbers can be a bit tricky. Let's look at how to do 4 - 7. We start at 4 on a number line, and then move 7 to the left, since we're subtracting. We end up on -3. Here is the rule that we use: Convert the problem into 4 + (-7). That is really all subtracting is. It's just adding the negative version of the second number. Copyright © MathWithLarry.com

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