Class room visit:

We visited elementary kids with several experiments to test their cognitive development.
Three of the experiments were: square vs. blue, coin and rice experiement.

In the square vs. blue experiment, we cut out more squares than cirlces out of a blue paper and asked the kids whether there are more squares or blues. All of the children my group answered that there are more squares. They did not realize or recognize that the circles were also blue color thus there are more blue shapes and square. Other groups reported that there were some kids who got the answer correct but then even those few took a very long time to figure out the correct answer. These results clearly indicates that the kids we experiments with, aging from 5 to 7, did not reach the cognitive developmental stage to understand the concept of subset and a whole set.

In the coin experiment, we lined up 10 coins closed together and 9 coins quite far from each other, under the 10 coins, so that the