When two numbers have the property that their product is one, this relationship is called:

When two numbers have the property that their product is one, this relationship is called:

• A. Inversely related or proportional
• B. Related or Proportional
• C. Directly related
• D. Reciprocal relationship

Answer: (D)

The idea being tested is reciprocal (multiplicative inverse) pairs. If two numbers multiply to 1, they are reciprocals of each other—their relationship is a reciprocal one. For example, 4 and 1/4 multiply to 1, and 3 and 1/3 do as well. That’s why the term “reciprocal relationship” fits best: it directly describes numbers whose product is exactly 1. The other options are less precise. Inversely related or proportional describes a broader idea that one quantity goes up as the other goes down, but it doesn’t specify that their product is 1. Directly related means they move in the same direction, which isn’t the case here. The vague “related or proportional” phrase doesn’t capture the specific reciprocal nature.

The idea being tested is reciprocal (multiplicative inverse) pairs. If two numbers multiply to 1, they are reciprocals of each other—their relationship is a reciprocal one. For example, 4 and 1/4 multiply to 1, and 3 and 1/3 do as well. That’s why the term “reciprocal relationship” fits best: it directly describes numbers whose product is exactly 1.

The other options are less precise. Inversely related or proportional describes a broader idea that one quantity goes up as the other goes down, but it doesn’t specify that their product is 1. Directly related means they move in the same direction, which isn’t the case here. The vague “related or proportional” phrase doesn’t capture the specific reciprocal nature.