Some kids collect baseball cards. George Cornelius Factor (aka GCF) collects fractions. So when a beautiful 5/9 fraction is stolen right when it's about to be auctioned off, GCF is on the case! Knowing that fractions can be disguised, GCF invents a reducer that strips away the disguise, reducing the traction to reveal its true form. 32 pages, softcover. Ages 7-10 / Grades 1-5.