DFA diagram to recognize arithmetic expressions

I need to draw a DFA diagram that can recognize arithmetic expressions, varialbes or brackets are not allowed. It can only contain numbers and four arithmetic operators.

And it has to accepts any number string with or without sign - e.g. 5, -7 , +15. And the numbers strings can be mixed with arithmetic operators - e.g. 3+5 , -1+7*3.

I don't know if my diagram actually performs this requirements.

DFA Diagram