Introduction to Counting

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Cardinality

The number of objects in a finite set — the answer to “how many?” after a correct count.

Stable order

Use the same counting-word sequence every time so each word matches exactly one object.

Watch the correspondence

Pointing at the same item twice breaks one-to-one correspondence.

S(n) = n + 1

Quick practice

Using a sample question until this lesson includes practice data. XP sync rolls out with account progress (Phase 4).

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