Subtraction is an easy concept that teachers can teach and kids can learn. The key is to use a tool that is interactive and age-appropriate. This is an example of such tool. With cool colors and an... This description may be from another edition of this product.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.