I hate you.
Not really.
But I hate you.
This is why I cannot get high scores on IQ tests.
I wiki answered that shit and if this is the kind of shit they teach 8 year olds, I'm not surprised we have so many terrorists walking around building bombs. What happened to math like 'John has 30 cookies, he eats 24, what does John have now? Diabetes'.
I swear things went downhill the minute they added letters to mathematics.