Good Way To Split Data Into Two Side-by-side HTML Tables?

Basically, given data like this:

Col 1 | Col 2
1 7
2 8
3 9
4 10
5 11
6 12

I want to have the page display something like this:

Col 1 | Col 2 Col 1 | Col 2
1 7 4 10
2 8 5 11
3 9 6 12

The purpose of course is that I have extra horizontal space with less vertical space. Obviously it doesn't take a rocket scientist to pull this off, but I feel like I might be missing a cleaner/easier solution than my own, perhaps using CSS or clever use of an existing ASP.NET control. It seems like a common enough requirement, but I can't quite get the search terms right to find what I'm looking for.