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More on MDAS

Hit multiplication and division first...

8 x 2 + 3 - 10 / 5 + 6 - 3 x 4 = 16 + 3 - 2 + 6 - 12 = 19 - 2 + 6 - 12 = 17 + 6 - 12 = 23 - 12 = 11

Just so you know, you don't REALLY have to go left to right with addition and subtraction.  Sometimes, it's easier to do it by gathering up all your "plus" guys and gathering up all your "minus" guys:

16 + 3 - 2 + 6 - 12 = +25 - 14 = 11

YOUR TURN:

6 + 9 / 3 x 4 - 1

5 x 6 - 8 / 2

18 + 12 / 4 - 20 / 2 + 9