This is a simple one-digit calculator. You can't use numbers higher than 9, because it will only take the first number, and if you press another number button before you have pressed a function button, the first number will be replaced. There may be a way to do that with lists, but I did this on my laptop which is a Mac OS X (it's not compatible with 1.3.) I might add those features once I get the project onto the other computer. Click on the symbol next to "ScratchCalc" to give the calculator a new look!