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MF.PR.4 Warmup MF-018-A02-V03

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

Find a missing value on a double number line

Problem

A double number line shows notebooks on the top line and dollars on the bottom line. The aligned ticks are spaced evenly. \(\text{One}~\text{pair}\) is labeled \(4~\text{notebooks}\) with \(\$10\), and a farther aligned pair is labeled \(12~\text{notebooks}\) with \(\$30\). What dollar amount should be at the tick aligned with \(20~\text{notebooks}\)?

Double number line with notebooks on the top line and dollars on the bottom line. Evenly spaced aligned ticks show 4 notebooks with 10 dollars and 12 notebooks with 30 dollars. The tick for 20 notebooks aligns with a blank box on the dollars line. Open full size
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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
Find a missing value on a double number line