Cardinality to 20

Print: Ages 8–9 · 3–4 min · core · reflection-symmetry · independent-practice · value-entry

Watch: Watch whether the learner tests every frame and counts each frame once. Entering 6 is decisive evidence that they counted the six connected tile groups inside the four passing frames.

Misread: Noun misread: count frames, not tiles or separate groups (6). Action misread: reflect left to right without turning or sliding; answer misread: count passes, not failures (5) or all frames (9).

Curriculum: This task uses vertical line reflection to classify finite visual objects and count the qualifying set. The scored skill is applying an exact symmetry predicate and returning its cardinality, with one counterexample enough to reject a pattern.