Rubber Ducky math manipulatives support kindergarten students' development of number sense. It is also the perfect solution for first grade students working below grade level. As they play games students will count the number of objects in order to answer "how many"; learn number names; review more, less, and the same; and classify objects into categories based on attributes. Teachers can create additional games such as counting backwards, classifying numbers as odd and even. These activities allow students to move at their own pace and become more independent learners. Some activities are self checking for use in centers.