I showed this book and read it aloud to my kids in Junior Classical League's last meeting, and except for one kid, the  club's president and a Latin aficionado, none of us knew about the Roman numerals on the two last pages! Have fun learning!

From the publisher: 

Page IV, Super Bowl XLV. Built in MMVIII. Roman numerals are everywhere---on clocks, in books, and on buildings. But what do Roman numerals mean, and how does one use them? Fun with Roman Numerals is a straightforward and appealing introduction to a timely topic. On a scale of I to X, it's an XI!