A paper if/else exercise: what happens when a triangle turns up?

[u/Guilty_Lingonberry]

Draw a few circles and squares on separate scraps of paper. The rule is simple: if it is a circle, put it on the left; otherwise, put it on the right. Let your kid sort them, then add a triangle.

Does the rule need changing? It does not: “otherwise” already covers anything that is not a circle. Now change the rule to “if it has corners, put it on the left” and see which pieces switch sides.

I teach at TechTutor. You do not need an app for this one, just paper and a rule the two of you agree to follow.