How hard can it be to measure out two pounds? A short performance task introduces a situation where a balance scale is broken. It gives a method for measuring out two pounds and asks learners to evaluate the procedure. They must prove mathematically, using proportionality and rational functions, whether the method is valid.

Concepts

writing equations, rational equations, proportions

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Additional Tags

math

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Instructional Ideas

• Apply the resource as a formative assessment
  

Classroom Considerations

• Pupils should be familiar with situations involving rational functions
• Experience with proportionality is necessary
  

Pros

• Includes an answer key with several alternative approaches
• Provides a worksheet for the lesson
  

Cons

• None

Common Core

HSA-CED.A.2