An accessible text and colorful illustrations add up to fun in this vibrant guide by the celebrated author and illustrator of “Working with Fractions” and “You Can, Toucan, Math.” 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!