Convert Columns To Blank Instead Of Zero's

Hi I have a stored proc that pulls in data, I have four columns that, where there is data I need to times by 100 but when empty to remain empty, currently where empty I end up with 0's

Do i need to do a convert or something? can someone help me out thanks




Code Snippet
USE [WINDRUSHDAL]
GO
/****** Object: StoredProcedure [dbo].[spgiffordstelesalesdev2] Script Date: 02/28/2008 12:34:21 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
ALTER PROCEDURE [dbo].[spgiffordstelesalesdev2]
AS
BEGIN
SET NOCOUNT ON;
SELECT
BLCUSA AS Company,
BLCUSB AS Account,
BLDELN AS DeliverTo,
blcnam AS [Account Name],
BLCTS1 * 100 AS Monday,
BLCTS2 * 100 AS Tuesday,
BLCTS3 * 100 AS Wednesday,
BLCTS4 * 100 AS Thursday,
BLCTS5 * 100 AS Friday
FROM
LIVEAS400.S65C422B.WRFDTA.PARDADR AS PARDADR_1
WHERE
(BLCUSA = '2')
Union
SELECT
abCUSA AS Company,
abCUSB AS Account,
0 AS DeliverTo,
abcnam AS [Account Name],
abCTS1 * 100 AS Monday,
abCTS2 * 100 AS Tuesday,
abCTS3 * 100 AS Wednesday,
abCTS4 * 100 AS Thursday,
abCTS5 * 100 AS Friday
FROM
LIVEAS400.S65C422B.WRFDTA.PARNADR AS PARNADR_1
WHERE
(abCUSA = '2')


END