Lydia was doing division without realizing it was based on Whole Number Properties.
What are Whole Number Properties?
Under addition and multiplication, whole numbers are closed. Whole-number addition and multiplication are commutative. Whole-number addition and multiplication are associative operations. It is distributive in the sense that it prefers multiplication to addition.
Whole numbers such as 0, 1, and 2 serve as the foundation for understanding more complex number identifiers such as real numbers, rational numbers, and irrational numbers.
Lydia was dividing without realizing she was using Whole Number Properties.
Thus, the answer is division.
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