Seriously, I hate this calculator. On my laptop, typing this, I can easily just touch the keys on the keypad, they depress, and without even looking, I know what is showing up on the screen. With this calculator, you have to slowly press each button, rather firmly, then look at the little screen to make sure what you typed actually showed up. When you are doing algebra, or even pre-algebra, you don't have the time to have to slowly do this. You jut want to type in the equation and check the answer. This stupid thing, I get the wrong equation entered half the time because I didn't press this or that button hard enough, and heaven help you if you press them faster than they can appear on screen. I imagine they are still using chips from the 1970s. Also, when doing homework, I want to be able to pick this up and start using it, but it shuts off after a minute, and you have to check that it IS on, and if not, turn it on! It uses solar power, which is fine, but I'm in a well-lit room using it, so why the need to shut off every minute?