Looking for some MySQL Code (Altitude to FL)

Hi, with a percent chance of the low teens I'm looking for a way in MySQL code to report flight level from altitude. For the best part:

concat("FL",left(altitude,3)) gets me what I need but when the altitude is reported as 40950 I'm really looking to round up to 41000 but can't seem to find a function for rounding up integer values.

I'd appreciate any help, thanks.