To substract the numbers shown by the method known as the "Arrow way" you must rewrite 430 and substract the hundredths (In this case, it is 200). Then you have to substract the tenths to that result (Result obtained-30). This explanation is shown below:
430 --( -200 )---> 230 --( -30 )---> 200
Therefore, the solution of the mathematical operation 430-230, using the arrow way, is: 200