Integer operations are HUGE in math because once you learn them, they DON'T go AWAY! In fact, I have known many an 8th grader to get these rules confused and make mistakes that mess up the rest of their work. So, getting these correct is very important for middle school students.
This flowchart will help organize the rules in a concise manner. It's dangerous to teach students to only change a subtraction sign, because in high school that doesn't always work the same way (think distributive property!)
You can use this as a quick reference for students who need to practice perfectly.
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