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The property used in the given expression is the identity property of multiplication, specifically the multiplicative identity property. This property states that any number multiplied by 1 is equal to the original number itself.
In the provided calculation:
5 × 1 = 5
This showcases the identity property of multiplication because when you multiply 5 by 1, the result is 5, which remains the same as the original number.
Therefore, in this case, the property being used is the identity property of multiplication.
