Mathematics·Counting & Cardinality·conceptual
One-to-one counting
One-to-one correspondence when counting objects: each object is paired with exactly one number name
Suggested ages 4–6
Evidence of understanding
- 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
Assessment prompt
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?
Standards alignment
K.CC.4US · ccss-math
Relationship Between Numbers and Quantities
Common Core State Standards for Mathematics · K
K.CC.4.aUS · ccss-math
One-to-One Correspondence
Common Core State Standards for Mathematics · K