Expand your Radius? Audio Learning System library with this new interactive Addition & Subtraction Kit! The latest addition to our multi-sensory learning program, this features varied and differentiated instruction in math concepts and reinforcement activities in an appealing range of formats. Students simply insert a content CD into the Radius?, scan a bar-coded CD Card, and begin! Student-directed activities are ideal for centers or individual use and promote independent learning skills. Included blackline masters feature open-ended graphic organizers to encourage higher-order thinking. Kit is designed for the Radius? Audio Learning System (LER 6910), which features four headphone jacks, allowing up to 4 students to complete quiet activities simultaneously. Includes 24 double-sided cards (8 ?"L x 9 ?"H, 36-page spiral-bound blackline master book, CD and 140 manipulatives.