"We have played with many of the ‘for pay’ solutions that either go light or toss in cuteness that isn’t needed. Last week, someone discovered Calculator LCD and it spread like wild fire amongst those needing to keep it simple. The free app has the option of changing the display background from retro yellowish to white and back again. And… there is the addition of Tax, not sure where that came from but we are in a Tax charging state so it might be handy. Otherwise, we add, subtract and divide our way to the end of another meeting where we are asked if the quantities add up as our whiteboard quick math showed us. Not once did someone ask for the circumference of the table over the arch of the legs to find the size of a mat to go under it!"