The young cowboy has his two hands full with five little ducks. They need three sacks of food and four bundles of hay. And when they each bring home a friend, it's twice as much work. For 10 little ducks, he needs double the food, double the hay and double the hands! The first step in mastering basic addition is adding a number to itself (for example, 3+3). Used with permission from Stuart J. Murphy.