SI System + Percent Error

Prefixes are essential to change the power of a number
Tera 10^12
Giga 10^9
Mega 10^6
Kilo 10^3
Hecto 10^2
Deca 10 ^1
Deci 10 ^-1
Centri 10^-2
Milli 10^-3
Mirco10^-5
nano 10^-9
Pico 10^-12
Femto^-15
We see prefixes everyday to represent VERY LARGE or VERY SMALL numbers
For example...

32 MEGA(10^6) byte of memory meaning 3.200,000 bytes of memory!!!  Want to see the POWERS OF POWERS!?!?!Here we go (:Keep on reading this blog to watch the video (: its on the next post  
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Experimental Acurracy
Maximum accuracy of any measurement is 1/2 of the smalles division of a measuring device
 For example :) odometer in a car has a maximum accuracy
of +/- 50 m

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  ERROR D:
There are 3 reasons of error (even though we will get error in measuring almost all the time -.-)
1)Physical errors in the measuring device
2)Sloppy measuring
3)Changing ambient conditions

Luckly, I guess, there are ways to calculate how wrong you are.

1) Absolute Error:
AE= Measure-Accepted
Positive number as a result means it is over the accepted value
Negative number as a result means...its the end of the world. No, it means it is under the accepted value (unless the result is 2012...then you freak out)

2)Percent Error
It can simply be calculated like this:
%Error= (Measured-Accepted/Accepted) x100
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Well thats the end of this summary of this lesson stay tuned next time when we learn about SIGNIFICANT DIGITS AND SCIENTIFIC NOTATION :D