3rd grade
posted by sajwkj .
wht is 500 @4

" @ " is not a recognized mathematical symbol.
Therefore 500 @ 4 makes no sense. 
Indicate subject in subject space rather than just your grade level.
Don't know what the @ means in math.
500/4 = 500 divided by 4 = 125
500 * 4 = 500 times 4 = 2000
500  4 = 496
500 + 4 = 504
I hope this helps.