It is not. Look at the millions of people across the world who do not speak English but are still doing maths.
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Because it is easier
Could change from person to person. There is no one subject more important than another because everyone is different. Thought it is true that maths is important. You need to know you basic mathamatics aswel as basic english. If you dont know these then there is a high chance that you will not get too good a job. (Not saying that it is'nt possible, just not common)
The difference of maths and geography is maths is more better than geography
Probably a gram. More physics than maths, but ...
Only in maths when answering a question with a fraction, other than that, a decimal is more of a full stop