Im not sure, but i think all. im sure its used in binary, octal, decimal and hexadecimal
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Real numbers are closed under addition and subtraction. To get a number outside the real number system you would have to use square root.
Subtraction is the addition of a negative number.
Subtraction!
No.
There are a number of ways one can learn subtraction. Perhaps the best way is to find one that can spend some time teaching one subtraction. There are a number of workbooks also available.