Back to Define appropriate quantities — Problem 1 · Task Set 5

Exercises: Define Appropriate Quantities for the Purpose of Descriptive Modeling

Work through each section in order. For explanation problems, write in complete sentences. There is often more than one defensible answer — focus on justifying your choice clearly.

Grade 9·22 problems·~45 min·Common Core Math - HS Number and Quantity·standard·hsn-q-a-2

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Fluency Practice

Quantification means selecting or designing a specific measurable expression of an attribute. Which sentence best describes what makes a quantity choice a modeling decision?

A quantity choice is a discovery — the correct quantity is already determined by the situation.

A quantity choice is a decision made for a purpose — different quantities can legitimately measure the same attribute while telling different stories.

A quantity choice is arbitrary — any number with a unit will do.

A quantity choice is permanent — once chosen, it cannot be revised.