What is the primary skill involved in establishing one to one correspondence?

The primary skill involved in establishing one-to-one correspondence is effectively counting each object in a set once, while ensuring that there is a direct link between the number and the objects themselves. This technique is foundational in early mathematics and is crucial for developing a strong understanding of quantity and counting principles.

In one-to-one correspondence, each object is paired with a single count or number, ensuring that no object is overlooked or counted more than once. This skill helps children understand that the last number stated reflects the total number of objects present in the set. Establishing this connection is essential for developing number sense, as it encourages accurate counting and reinforces the concept that numbers represent specific quantities.

The other options do not capture the essence of one-to-one correspondence. For instance, counting multiple times or estimating does not support the principle of establishing a clear and singular relationship between objects and numbers. Thus, counting each object once with one touch eliminates any ambiguity and fosters a deeper comprehension of counting principles.