That is one of the unsolved problems of mathematics.
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Maths develops when we encounter problems, and evolves to cope with new problems. If you think about it, when caveman started to communicate with other cavemen he needed to tell them how many mammoths he had seen. That's numbers, and hence maths.
This is a very short answer, but it tells you the basics. Maths is used in science; in science, you measure amounts. Maths is used in history; you use dates. Maths is also used in geography; in geography you count population and take measurements. Maths is used in music as well; you count the beats, multiply the beats and arrange them. There are many other uses of maths in these subjects, if you don't constrain yourself to thinking that maths is STRICTLY hard arithmetic and algebraic problems you will see that maths is in everything you do. From cooking, to breathing, maths is everywhere.
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i hate maths kate barney
GEM Maths is for students who are very good at maths, who likely got a 5 in 5th Grade FCAT Maths assessment and who are willing to commit MANY hours of maths homework. If a student can't give this kind of time and effort than Advanced Math is better.