Calculating Percentages

Here's a neat visual for percentages. You can fill in 2 of the 3 pieces of a percentage problem and it will calculate and draw a picture of the missing 3rd piece. It's not my favorite way of working percntage problems, but it certainly works; plus you may have been taught to do percents this way.
Hint: after filling in the 2 pieces you know, you need to click on the third piece before you ask it to calculate.
http://nlvm.usu.edu/en/nav/frames_asid_160_g_2_t_1.html

Found another site for solving percentages - using the proportion method (remember, we did proportions just last week) This site has examples as well as many practice problems. And when you get through with those practice problems, guess what - there is another page of problems to practice! No excuse now! HaHaHa! (They even included the answers so you can check yourself.
http://amby.com/educate/math/4-2_prop.html