What’s happened to the calculator?

Just wondering what’s happened to the extrude number pad on IOS. Used to be able to just hit Plus (+) and then the number and then hit equals and see what you are going to resize it to. Also doubles s a calculator (as suggested by shapr3d). Now I hit plus and it clears the previous number and I get an error. And when I do do the calculation it just makes the resize without any display update