How Do I Know if My Child Has Developed One-to-One Correspondence?

One-to-one correspondence is an essential component of becoming fluent counters. But knowing that your child should develop this skill is very different than knowing if your child has developed it.

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So, how do you know if your child has developed one-to-one correspondence?

One-to-one correspondence means your child knows that each number word is paired with one, and only one, object. They also understand that all objects in a set must be counted. Your child has one-to-one correspondence if they:

  1. Don’t skip any objects when counting a set

  2. Don’t count any objects more than once

It is common for children to develop one-to-one correspondence gradually. You may notice your child has strong one-to-one correspondence when counting within 10 but makes more mistakes as the numbers get larger.

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