Ten fat flies buzzing around but along came a spider and ate one! Just flip the transparent page back and forth to see what happens, as ten becomes nine...until there is only one. Great for counting, adding and subtracting. This book is part of the acetate series by author and illustrator Patrick George: interactive books with transparent pages which change the action. Other books in the series are: Opposites, Colours, Shapes, Oh No!, When I grow up...and Animal Rescue