Subtraction is one of the most important aspect of the four basic operations in arithmetic (the others being addition, multiplication & division). This concept helps the child to learn basic of mathematics and will be very helpful and important to understand later concepts of mathematics. This book covers basic subtraction skills and gives the child a framework for mastering mathematics in elementary school. Material: Polypropylene Age: 5+ Years Dimensions: 22.86 x 0.76 x 33.02 cm Ring-bound: 12 pages