One-to-one counting
Mathematics · Counting & Cardinality · conceptual
One-to-one correspondence when counting objects: each object is paired with exactly one number name
What mastery looks like
- Point to or touch each object exactly once while saying number names
- Do not skip objects or double-count when counting a set
- Recognise an error when someone counts an object twice
Check your understanding
If One-to-one counting is counting a pile of grapes, do they touch or point to each one exactly once as they say each number — without skipping any or counting the same one twice?
Prerequisites
None — this is a foundational concept.