Sure, if all you want to do is add and subtract, multiply and divide, then that's all you need.<p>But if you want to work in machine learning, or driverless cars, or marine navigation, or any one of the hundred really, <i>really</i> cool things people do with computers, you need to be really, <i>really</i> comfortable with a wide range of stuff that's beyond addition and subtraction.<p>But sure, if you just want to do the programming equivalent of flipping burgers, percentages are about as far as you need to go.