Couldn't see how to include what I needed in a function, did some more research and wrote what I needed into query grid design.
In query grid:
Easting5: IIf([EastingN]<100,[eastingN]*1000,IIf([EastingN]<1000,[eastingN]*100,IIf([EastingN]<10000,[eastingN]*10,IIf([EastingN]<100000,[EastingN]*1))))