Integer operations include addition, subtraction, multiplication, and division.
First off I'll show you some vocab.
Vocab: integer- is a set of whole numbers and there opposite.
opposite: is the complete different thing. Ex: 3 the opposite is -3
Rules:Rules for ADDITION are if the signs are the same then add and keep the same.If the signs are different, then subtract and keep the sign of the bigger number.
5+6=11
5+-6=-1
Rules for SUBTRACTION are change it to addition by doing plus the opposite of the 2nd number.
Ex:3-(-6)=9 because you make it 3+(+6)=9
Ex:-3-6=-9 because you make it -3+(-6)=-9
Rules for MULTIPLICATION are if the signs are the same then multiply and make it a positive. if the signs are different then multiply and make it a negative.
Ex:-3 times -3=6
Ex:-3 times 3=-6
Rules for DIVISION are if the signs are the same then divide and make it a positive and if there different then divide and make it a negative.
Ex:-21 divided by -7=3
Ex:-21 divided by 7=-3
If you need more help heres a good site.
http://www.homeschoolmath.net/teaching/integers.php
Monday, November 24, 2008
Sunday, October 26, 2008
Solving Algebraic exspressions
Steps for solving key terms.
Variable: The number that is able to change to depending on the equation.
Steps for solving equations:
1. Ask your self what is being done to the variable.
2. Do the inverse operation to both sides of the equations.(Mathematicians call it isolating the variable)
3.Lastly write the variable as a correct number.
All together it looks like this Ex.
x-2=6( my variable is being subtracted by two)
+2 +2(I do the inverse operation)
x=8( I plugged in the answer)
!Make sure you dont do the same operation!
Check
If you are unsure that your equation is write you can do a check
To do a ckeck you:
1.Rewrite the equation
2.Plug in the number you think the variable is
3.Simplify the equation
4.Then you have the variable isolated
so you can see if your answer is right.
Right now I bet your wondering why am I doing all of this when will I use this.
Well in just about every job you use it If you can give me three jobs that dont then you proved me wrong. Here a few examples a pumber, any kind of salesman, and even baseball players.
http://www.algebrahelp.com/lessons/equationbasics/
Variable: The number that is able to change to depending on the equation.
Steps for solving equations:
1. Ask your self what is being done to the variable.
2. Do the inverse operation to both sides of the equations.(Mathematicians call it isolating the variable)
3.Lastly write the variable as a correct number.
All together it looks like this Ex.
x-2=6( my variable is being subtracted by two)
+2 +2(I do the inverse operation)
x=8( I plugged in the answer)
!Make sure you dont do the same operation!
Check
If you are unsure that your equation is write you can do a check
To do a ckeck you:
1.Rewrite the equation
2.Plug in the number you think the variable is
3.Simplify the equation
4.Then you have the variable isolated
so you can see if your answer is right.
Right now I bet your wondering why am I doing all of this when will I use this.
Well in just about every job you use it If you can give me three jobs that dont then you proved me wrong. Here a few examples a pumber, any kind of salesman, and even baseball players.
http://www.algebrahelp.com/lessons/equationbasics/
Tuesday, October 7, 2008
Factors and GCF
A factor is a number that can go into a bigger number a even amount of times.
Example:2 is a factor of 8 cause it goes into it 4 times without going over or under .
To find factors of a number you have to test each number to see if it goes in evenly.
Example: factors of 6 I would test 1 it works then 2 it also works 3 is another factor 4 deosnt work nor does 5. 6 goes in evenly too.
When you have two numbers and you need to find the GCF which is the greatest common factor. You would have to list factors of both numbers. Then you would have to find which factors work for both of the numbers. Then you pick the greatest one.
Example:6,12
6=1,2,3,6
12=1,2,3,4,6,12
http://www.helpwithfractions.com/greatest-common-factor.html
Example:2 is a factor of 8 cause it goes into it 4 times without going over or under .
To find factors of a number you have to test each number to see if it goes in evenly.
Example: factors of 6 I would test 1 it works then 2 it also works 3 is another factor 4 deosnt work nor does 5. 6 goes in evenly too.
When you have two numbers and you need to find the GCF which is the greatest common factor. You would have to list factors of both numbers. Then you would have to find which factors work for both of the numbers. Then you pick the greatest one.
Example:6,12
6=1,2,3,6
12=1,2,3,4,6,12
http://www.helpwithfractions.com/greatest-common-factor.html
Saturday, September 27, 2008
Exponents and Scientific Notation
How to Do Exponents
You first look at your base wich is the bottom number.
Then look your exponent wich is the top number.
The expnonent tells you how many times to multiply the base times itself.
example:two to the third power=8 because 2x2x2=8
Vocabulary
Base- like I said is the bottom number
Exponent- also like I said is the top number
How its used
Exponents and scientific notation are used in telling the speed of light without writing all the zeros
http://www.purplemath.com/modules/exponent.htm
You first look at your base wich is the bottom number.
Then look your exponent wich is the top number.
The expnonent tells you how many times to multiply the base times itself.
example:two to the third power=8 because 2x2x2=8
Vocabulary
Base- like I said is the bottom number
Exponent- also like I said is the top number
How its used
Exponents and scientific notation are used in telling the speed of light without writing all the zeros
http://www.purplemath.com/modules/exponent.htm
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