The Numbers game comes with dot tiles for the numbers 1,2 and 5. There are no dot tiles for the numbers 3,4,6,7,8 or 9.
The use of dot tiles for the Numbers game is meant to introduce small children to the concept of counting, while making it fun for them. It's not meant to be an all-inclusive learning experience for each number.
One of the goals of the game is to help children figure out how to make bigger numbers out of small ones by combining the small ones in different ways. The missing dots add a fun challenge to the game.
Have you heard of the term 'recreational math'? It's becoming increasingly popular among educators and parents to provide children with math learning experiences that provide joyful exploration and fun to complement the more academic approach. Numbers is a tool to enable recreational math.