Once finished with the 6 Kingdoms chart, use this attached visual to help you recall:

 

Picture 1: The 8 Taxa (groups) are in order of broadest to narrowest (meaning big to small). The broader the group (Domain), the more organisms there are in that group. As you go down the chart, you will notice the groups become smaller, meaning there are less organisms in those groups. The last taxon "species", is the most specific group.

 

Picture 2: There are 3 Domains & 6 Kingdoms.