Go here for a non-embedded dynamic worksheet.
Explore this activity using the pdf file.

Use up to three number lines to compare ratios. The top number line has the whole as 100 and the part shows percent; the wholes on the other two number lines can be changed from 1 to 200. Checkboxes show proportions and decimal values.

This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com