Div is an optimized division in which the fractional part (remainder) is discarded. Both sides of an expression using div must be of an integer (whole number) type.

var
   A:LongInt;
   B:Word;

Begin
   A:=3000;
   B:=100;
   Writeln(A div B);
End.

Output:
30

Source: Reserved Words

See Also:

mod, MATH trunc, MATH round.