"Kids, young and old, fall in love with math when they see how real-life and effortless it becomes thanks to these books." --Kimberly D. Mueller, Ed.D., First Grade Teacher, Ashbrook School, Lumberton NJ Doubling the Ducks is perfect for teaching doubling numbers to pre-K through kindergarteners. It's hard work, taking care of 5 little ducks. But when each little duck comes home with a friend--oh, no! Now it's double...