Comparing sets to 20
Given two visible groups with at most 20 objects each, decide which group has more, fewer, or the same amount using matching, counting, or grouping.
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Print: Ages 10–11 · 3–5 min · Foundation · Compare visible counts · Guided practice · Match badge groups
Watch: Watch whether the learner compares both sets before selecting. A correct Left choice with attention to the unmatched apple is decisive evidence of cardinality comparison rather than side guessing.
Misread: Right suggests one-side guessing; Same suggests a default middle choice or a missed leftover; “2” shows correct counting but a misread of the group-choice action.
Curriculum: The task compares finite-set cardinalities through one-to-one correspondence. The scored skill is selecting which set has more objects while distinguishing greater from equal.