Ratio

-Ratio-
Ratio is a method used to compare things one to another.
Mostly,when ratio is used,the number of items are converted into simplest form.
For example,the ratio of Ken's money to John's money is 1:3.
This tells you,that John has 3 times more money than Ken.That means that if Ken has $5,John will have $5X3 which is $15.
To convert a ratio into a fraction,simply place the first number of a ratio as the numerator and the second,the denominator.For example,3:4 is 3/4(3 over 4).
Ratio is used for many things in life.
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Average

-Average-
Average,is,the amount that is fairly inbetween the largest and smallest.
To find the average,add together the number of items and divide it by the number of people/things having it.

For example,John has 2 apples,Mattew has 3 pears and George has 4 oranges.
What is the average of the number of fruits?
The average would be 3 fruits in total.
Steps:
2+3+4=9
9[divide by]3*=3
Still confused?
Well,here's another question.

Josh has 3 buttons,Ben has 6 buttons,Tony has 2 buttons and Max has 1 button.
What is the average of the number of buttons?
The average is 3 buttons.
Steps:
3+6+2+1=12
12[divided by]4*=3
*=Number of boys(Refer to line 3 and 4)
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Adding of unlike fractions

Update(16/6/07):I deleted the 'Backtrack' review.If I have time,I might create a new post about it.Sorry for any inconvenience
-Unlike fractions-
An unlike fraction is discovered when,for example,you try to add 2 fractions of more with different denominators.Here's a few with guides to explain to you better:
4/9+3/18=8/18+3/18
=?
You notice that 4/9 becomes 8/18.No,it ain't magic!Note that you must always change the two or one denominator(s) to the same number EQUALLY.
I am talking about the denominators now.Look at the denominator of 4/9 and 8/18.9x2=18.4x2=8.The denominator is the same as 3/18's.Checkpoint done..
Next,when you times the denominator by 2 to make 18,the numerator which is 4 has to times by 2.Its like when you times the denominator by 3,for example,the numerator must be times the same amount of number you did for the denominator(which is of course,3!).Tah-dah!Checkpoint 2,done!So the answer is 8/18+3/18=11/18(Note:You must not add the denominator!Basic fraction skills needed!).
2/6+2/4=4/12+6/12
=?
Surprised?This might seem hard but the question above just uses the same concept.Always times the denominators till you get the same number.One important thing is that you times them to the 'earliest' number.For example,when you times 4 and 3,the 'earliest' number that you can get is 12,although you can also get 24 each.Once you get both to have the same denominators,times the same number as you did for the denominator but now,for the numerator.Example,look at 2/6.If you times 6 by 2 to get 12,2 must also times 2(just like 6) and you get 4/12.Once you use this same concept for both fractions,add them all up.The answer for this question is 10/12.
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Phew!Thanks for reading this post!

Calculating the volume of a cube or cuboid

There's a straight away easy step to answering what is the volume of a cuboid*.
The formula should be:Length X Breadth X Height.Which equals to cubic centimeters.
So how do we know this is the formula?ICEYDRAGON explains it all.-Eric Aw.CEO of IceyDragon
------------------------------------------------------------
-So we know:L X B X H
L:How long the cuboid is.
B:How broad the cuboid is.
H:How tall the cuboid is.
Cuboids and cubes should be abit same but isn't.
-Diffrences
Cubes:All sides are same
Cuboids:No sides are same
-Similarities
Cubes:All 6 sides
Cuboids:All 6 sides
DONE
Used for home revision.