What is 9-9*10?

9-9*10 is a mathematical expression that can be simplified using the order of operations. According to the order of operations, we first have to perform the multiplication before subtraction. Thus, we perform 9 times 10 which equals to 90, then we subtract it from 9.

So,

9-9*10 = 9 - 90

= -81

Therefore, the value of 9-9*10 is -81.