Abstract:
Few researches have been concerned about relation between children's spatial thinking and
number sense. Narrowing for this small research, we focused on one component of spatial thinking,
that is structuring objects, and one component of number senses, that is cardinality by determining
quantities. This study focused on a design research that was conducted in Indonesia in which we
investigated pre-school children's (between 2 and 3.5 years old) ability in making structured
arrangement and their ability to determine the quantities by looking at the arrangements. The result
shows us that some of the children were able to make such arrangement. However, the children
found difficulties either to determine quantities from those arrangements or to compare some
structures to easily recognize number of objects.
