<p>Teach place value, numeration, and measurement of volume, area, and length. 1 wooden thousand cube ( 10 cm x 10 cm x 10 cm) l 0 wooden hundred square ( l cm x l cm x 10 cm) 10 wooden ten bar ( l cm x l cm x 10 cm) 100 wooden single cube ( 1 cm x l cm x 1 cm) (For age 6-12)</p>