Week in Review 9/24/10

What we did this week:

We learned the rules for multiplying and dividing integers first. The rules are this:
-When multiplying or dividing 2 numbers with different signs, the answer will always be negative.
-When multiplying or dividing 2 numbers with the same sign, the answer will always be positive.
So for example:
-10 x 4 = - 40
-6 x -9 = 54
It is important to not get these rules confused with the addition/subtraction rules. On Tuesday you created a foldable to help you learn these rules.
The addition rules are as follows:
-When adding 2 numbers with different signs, subtract the numbers (ignoring the sign), and then keep the sign of the larger number.
-When adding 2 numbers with the same sign, simply add the numbers (ignoring the sign), and keep the sign.
Example:
-5 + 8 = 3 (8-5 is 3 and 8 is bigger than 5 so the answer is positive)
-7 + -9 = -16 (9+7 is 16 and the sign is negative so the answer is also negative)

The subtraction rules go a little something like this:
-When subtracting 2 numbers you should remember this; KEEP, CHANGE, TAKE THE OPPOSITE.
You might also remember it like this; SAME, ADD, CHANGE (SAC).
Regardless what you are doing is changing the problem to an addition problem and then refer back to those rules to solve.
Example:
4 - (-7) = 11 (Same, add, change; 4 + 7 = 11)
7 - 17 = -10 (Keep, change, take the opposite; 7 + -17, subtract and keep sign of larger number; 17-7=10 and 17 is bigger than 7 so answer is negative.)

Students it is very important that you understand these rules and how to use them. If you practice these you will understand them.

On Friday we studied some word problems and identified key terms that help us work these word problems. You were then allowed to create your own word problem for an opportunity to see your problem on a benchmark as extra credit. I will collect these on Monday.

Report card grades will be due on Friday so make sure you have everything turned in. You should know before Friday if you are failing my class or even if you have below a 75. Let's get those grades up and remember to DO WORK AND STAY FOCUSED!

Ms. Ray