Monday, April 23, 2012

Monday, April 23rd

Sixth Grade

Making a double line graph - remember to label both axes, include a title, and make a key!

Seventh Grade

Math: Adding and Subtracting Integers

Here are the rules:

INTEGER ADDITION

You can tell it's integer addition if there is a + sign in between the numbers.

When the signs are the same, ADD, and keep the same sign.

Examples: 6 + 7 = 13     (-6) + (-7) = -13

(Some books and worksheets will use the parentheses to make it clear that the negative sign goes with the number and isn't a subtraction sign.)

When the signs are different, SUBTRACT, and use the sign of the bigger number. (whichever number is bigger ignoring the sign)

(-5) + 3 = -2   The signs are different, so you subtract 5 - 3 to get 2. Then, since 5 is bigger than 3, you use the negative sign.

7 + (-10) = -3 The signs are different, so you subtract 10 - 7 to get 3. Since 10 is bigger than 7, you use the negative sign.

(-2) + 9 = 7 The signs are different, so you subtract 9 - 2 to get 7. Since 9 is bigger than 2, the answer is positive.

INTEGER SUBTRACTION

You know it's subtraction when there is a minus sign between the numbers.

It's much easier to change all subtraction problems into addition problems by following these steps:

1. Change the minus sign to a plus sign and changing the sign of the next number.
2. Follow the rules for integer addition.

(-5) - 3 

Change the minus to a plus and change the 3 to a -3. Like this:

(-5) + (-3)

Now, since the signs are the same, add and keep the same sign. The answer is -8. Basically, we are giving the 3 the negative sign.

Here's another example:

10 - (-2)

You see "minus a negative" here so change it to "plus a positive" (click, click!)

10 + (+2)

Now, since they are both positive, just add! The answer is 12.

Here's one more:

2 - 14

Change the minus to a plus and change the 14 to -14.

2 + (-14)

The signs are different, so subtract 14 -2 and get 12. Then, 14 is bigger than 2, so the 12 is negative. The answer is -12.

Email me if you have questions!

Geography - Chapter 16 Vocabulary Activity worksheet.

Eighth Grade

Pre-Algebra: Permutations Worksheet

Email me if you have questions on this. Everyone seemed to get it pretty well.

Algebra I: Solving quadratic equations by factoring. Email me if you have questions! Be sure to use your example pages.

See you tomorrow,

Mrs. Swickey