Sheril KirshenbaumMath Skills x Stage of Life
(Okay, I do a bit more than spreadsheets, but I still chuckled). Not sure who made this, but it's brilliant 😆
Update: This comic is by http://pearlsofrawnerdism.com/ Thanks @StellaLunaObs
James Roper@Sheril My most difficult maths problems that I have to solve on a daily basis are working out whether to use greater than, or greater than or equals, to avoid off by one errors in loop termination.