10 exp 3 equals

I think you pressed 10*exp3  instead of just just exp3

I am pretty sure that is what you would have done.   

If you know the answer then why are you using a calculator?

If calculator can not answer simple equation how can it be trusted to assist in a more complicated equation

But thanks again for your non answer

Maybe you forgot to clear it before you put the problem in.

Or maybe you put it in wrong.

Or the calculator could be messing up because it's in a different mode. (Such as radian and degree) If you leave them in radian mode (I think) then you can get crazy answers. It's one of the two, I'm fairly sure you're supposed to leave them in degree mode though.