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This example shows, how to round float number, if you want to get result with specified number of numerals after delimiter.

procedure TForm1.Button1Click(Sender: TObject);
var
  Num, Pow: Real;
  Count: Integer;
begin
  Num:=StrToFloat(Edit1.Text);
  Count:=StrToInt(Edit2.Text);
  Pow:=Power(10,Count);
  Num:=Num*Pow;
  Label3.Caption:=FloatToStr(Round(Num)/Pow);
end;

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