Here's a calculator! Click on the buttons to do your normal calculator stuff. The engine is made out of 1 sprite, + another sprite for pen text. That means you could put it in your own project, be sure to credit @-FiFiZ- if you do so! You can remix and add more stuff to it, it's quite easy to. But for now, I'm satisfied with what there is. For more experiments; https://scratch.mit.edu/studios/30074866/
