Problem preview
MF.PR.4 Standard MF-018-A05-V01

Use ratio tables and double number lines to solve missing-value and scaling problems.

Solve a contextual ratio-table problem

Problem

Use the proportional table to calculate the cups of rice needed for \(20~\text{people}\).

Big Picture

What this problem is really about

The target column pairs twenty people with an unknown rice amount, so we’ll scale from a complete column rather than mix entries. We’ll find the factor from ten people to twenty and apply it to the matching six cups. Scaling the five-person and three-cup column directly to twenty gives a second check on the recipe.

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Four variants of this problem type
Curriculum context
Standard
MF.PR.4
Category
Proportional Reasoning
Domain
Representations
Objective
Use ratio tables and double number lines to solve missing-value and scaling problems.
Problem type
Solve a contextual ratio-table problem