1. Create sample db
use master
go
CREATE DATABASE [test] ON  PRIMARY
( NAME = N'test', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\master\test.mdf' , SIZE = 3072KB , FILEGROWTH = 1024KB )
 LOG ON
( NAME = N'test_log', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\master\test_log.ldf' , SIZE = 1024KB , FILEGROWTH = 10%)
GO

2. Create table

use test
GO
BEGIN TRANSACTION
GO
CREATE TABLE dbo.mytest
 (
 a int NOT NULL,
 b varchar(500) NOT NULL,
 d varchar(400) NULL,
 )  ON [PRIMARY]
GO
ALTER TABLE dbo.mytest ADD CONSTRAINT
 PK_mytest PRIMARY KEY CLUSTERED
 (
 a
 ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

GO

COMMIT

3. Insert test data
use test
go

Declare @int int
set @int=1
while (@int <= 30)
begin
if ((@int % 2)=1)
insert into mytest(a,b,d)
values(@int,CONVERT(char(500),@int),CONVERT(char(400),@int))

set @int=@int+1
end

4. select data and check page number

use master
GO
SELECT %%physloc%% rowid, sys.fn_PhysLocFormatter (%%physloc%%) AS [Physical RID],DATALENGTH(a) a_length, DATALENGTH(b) b_length,DATALENGTH(d) d_length, * FROM test.dbo.mytest
GO
output

so the 15 rows are saved in 2 pages: (1:153)  and (1:156)

5. insert a new row
use test
GO
insert into mytest(a,b,d)
values(2,CONVERT(char(500),2),CONVERT(char(400),2))
GO