![fosnot math double decker bus](http://newperspectivesonlearning.com/cdn/shop/products/double-decker-bus_{width}x.png?v=1627932631)
Develops the basic facts to 20 and works toward getting the facts automatic by employing the use of the 20-bead MathrackTM to support the use of the five and ten structures and strategies such as doubles +/-, making a ten, and compensation. After the unit is done, work on minilessons with the rack all year to get the basic facts automatic.