Is there a way to calculate formal charge without drawing the Lewis structure?

uacat

New member
I have an Ochem test coming up and on the practice test the question is to find the formal charge of (CH3)2SO. I know how to find formal charges with the Lewis structure but during the test I will not have time to draw structures and then calculate all of the charges. So I'm wondering how do you find the formal charges without having the Lewis structure?
 
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