When a valuable fraction goes missing, George Cornelius Factor (a.k.a. Everyday low prices and free delivery on eligible orders. See all 7 formats and editions Hide other formats and editions. All customers get FREE Shipping on orders over $25 shipped by Amazon. Knowing that the villainous Dr. Brok likes to disguise his ill-begotten fractions, GCF invents a Reducer—a tool that strips away the disguise, reducing the fraction and revealing its true form. When a valuable fraction goes missing Crack the case with George Cornelius Factor in this entertaining math adventure that introduces simplified and reduced fractions with equal parts intrigue and humor. GCF) vows to track it down. Fractions in Disguise: A Math Adventure Paperback – Mar 25 2014. by Edward Einhorn (Author), David Clark (Illustrator) 4.2 out of 5 stars 42 ratings. *FREE* shipping on qualifying offers. The dorki Buy Fractions in Disguise: A Math Adventure (Charlesbridge Math Adventures) (Charlesbridge Math Adventures (Paperback)) by Edward Einhorn (ISBN: 9781570917745) from Amazon's Book Store. Department. Eligible for Free Shipping. 1-16 of 22 results for Books: "fractions in disguise a math adventure" Skip to main search results Amazon Prime. Einhorn, who addressed probability in A Very Improbable Story, explains simplifying fractions in this whimsical, if sometimes convoluted addition to the Charlesbridge Math Adventures series. Free Shipping by Amazon. Any Department; Fractions in Disguise: A Math Adventure (Charlesbridge Math Adventures) [Edward Einhorn, David Clark] on Amazon.com.