Tuesday, September 7, 2010

Lesson 1-6 Subtracting Integers

I apologize for not having this post up earlier. We learned how to subtract integers. We learned how to model them, but we also learned the little tricks and rules that make it easier to remember how to do. The two rules we learned were these:

When subtracting a positive, it is the same as adding a negative. (Add the opposite.)

Ex. 6 - 9

We can rewrite it as an addition problem.

6 + (-9) = -3

We then can add as we learned in the previous lesson to get the correct answer.

When subtracting a negative, it is the same as adding a positive. (Add the opposite.)

Ex. 6 - (-9)

We can rewrite it as an addition problem.

6 + 9 = 15

Once again, now we can just add them together.

Homework for this section was a worksheet that had both addition and subtraction of integers on it. If you need an extra copy, be sure to ask me for one. Thanks!

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