Grades K - 5. Using the math balance and the more than 60 activities in this book, students develop a deeper understanding of the arithmetic concepts of quantity, composition and decomposition of numbers, place value, the four operations, and the commutative and associative properties. Comes with a digital book on CD that includes a virtual math balance. Works on all types of computers and all brands of interactive whiteboards. Paperback with CD. 72 pages.