But if you can’t justify a $150 calculator, there are some cheap and even free options out there to get the experience. To start with, HP has a free app that runs on Windows or Mac that works ...

But such concerns clearly don’t phase [Andrea Cavalli]. Sure he could just buy a scientific calculator, but it wouldn’t really be his scientific calculator. Instead, he’s taking the scenic ...

Many are calculators, including “a four-function, scientific, and graphing calculator.” The calculators are free to the public and can be accessed with a computer, tablet, or other personal ...