Numbers is intended to be an intuitive alternative to Microsoft Excel and other popular spreadsheets, but as a calculation program it is perhaps not much to expect it to perform calculations properly. However, there are instances where the program may incorrectly calculate values you enter. One of these is if you attempt an odd-root (e.g., the cube root) of a negative number, where there is a mathematical answer, but which causes Numbers to give an error when attempted. Continue reading ⇒