Parenthesis Exponent Multiply Divide Add Subtract First Parenthesis So we have 80+5=85. Now let's rewrite the problem. 10*85*6-1. I put the * sign because when you have a number like this: (10+5)1 It means you will subtract it by the number outside of the parenthesis. Now we need to move onto multiplication because there are no exponents so we skip that. Lets multiply from left to right. So we have 10*85*6-1 so lets start with 10*85=850 Now we have 850*6-1 So let's do 850*6=5100 Now 5100-1=5099 So your answer is 5099