Each chart has 100 spaces. You can have children read a certain number of minutes or pages to mark off each space or just mark one for each book read. The randomly-spaced stars are meant for small prizes, and the final space earns a large prize.
FONT CREDITS: For the "Reading Rocks" chart I used KG Only Hope by Kimberly Geswein. For the "Reading Racer" chart I used Blazed by Bright Ideas and Feast of Flesh by Nate Piekos.