## Monday, March 21, 2011

### Sophia's Great big book of integers

Integers can be positive or negative odd or even. A negative number is a number that is less than O. An even number can be divided by 2. An odd number can't be evenly divided by 2. O is an even number and it is not positive or negitive just 0

-NEGATIVE is blue
+POSITIVE is red
BOTH=zero pair

Remember the song "use a zero pair when subtracting something that is not there"
(use this song it will help)

Using brackets ( )

Standard form
Not using brackets ( X )

If you are having trouble and you don't understand intergers use a number line or think of it as money.(try it out right now)

Even= When you have an even number of negative factors the product is POSITIVE
ODD= When you have an odd number of negative factors the product is negative

Examples:

-11-(4)=-7 - - - - - - - (- - - -) Take this away

22-(-9)

22-+(-9)=31 + + + + + + + + + + + + + + + + + + + + + +

- - - - - - - - -

+ + + + + + + + +

These are supposed to be zero pairs
(sorry about the whole zero pair thing )

Sorry that I don't have blue and red circles but I think you get it

-9 +4 +(-9)

-9 +4 -9 Sorry I tried making a number line but it didn't work

-9 -9 +4 But a number line is a good strategy-for me anyway

-18+4= -14

example of multyplying integers:

7X-2

Forget the signs and multyply normaly

7X2= 14
Now you can go back to the signs
You know that a positive times a negative is a negative