When columns add the total was a decimal

I added to columns together to make a total of 50, but the total had decimal results. What am I doing wrong. I ave attached an image.

Hi Lisa,
It seems to me that some of the grade types involved have a minimum value of 1 instead of 0 , can't really say for sure without seeing its configuration.
I've created a small sample of a possible configuration with your case, hope that helps.

- All grade types must be set to the generic type, except for the Percent column which will have the grade type called 50 (see image below for its configuration) . It has a rounding configured to truncate to 1.