How to tell if a number is divisible by 7?

While studying for the GMAT, found this information and thought it would be good to share, seeing as how the test prep books all say that you can only find if a number is divisible by 7 through long division (Manhattan GMAT, Number Properties - updated for 12th Edition - page 14).

How to Aggregate Blogs

I purchased a .info domain name from GoDaddy for $1.99 for the first year and decided I wanted to aggregate the two blogs I've got into a feed that displays on the site.

Check out how to accomplish this task!