To simplify a ratio, type in your ratio using the + and - buttons above and below the digits (can't see them? Move the mouse over the numbers). For example, 47:9 would be 0 4 7 : 0 0 9. Then click Simplify. Depending on your numbers, it might take a while to calculate. Works with fractions, too! For more information or to report a glitch, please post a comment.
Have fun ratio-ing,
P.S. Feel free to remix. :)