subtracting integers
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Intro to Subtracting a Negative Integer by Canceling an IOU

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Trick for subtracting integers

I have algebra students, in high school and college, who struggle with evaluating expressions like 2 – 5. This is a ubiquitous problem. I have tried several strategies and the one that is easily the most effective is shown below. When a student is stuck on 2 – 5 the following routine plays out like…