Round to the nearest 1000

The final Math's task of the week!  To finish off, you are to round to the nearest 1000.  

 

The picture below contains a grid of 4 digit numbers.  For each square you have to round to the nearest 1000.  You are to work either vertical, horizontal or diagonal to create a line.  If you want, you can complete all the squares!

 

You can make it a two-player game and see who can complete as many squares as possible or create your own rules...you decide!