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Grade 3 · unit review

Review: Products, Work, and Choices

Trace production and exchange while recognizing limited resources and different preferences.

Download reviews and answer keys

Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Which part of an invented bookshop visit is a service?
2. Original chain: wood → cut boards → assembled shelf. Jo cuts wood into boards; Rei assembles boards. What is Rei’s input?
3. Fictional one-choice slot: chess 15 minutes, drawing 15 minutes, story 15 minutes. Order: chess, story, drawing. All fit. Choosing chess gives up which next-best alternative?
4. Ana has red and prefers blue; Bo has blue and also prefers blue. Would a red-for-blue swap match both stated preferences?

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Original pretend craft club: paper becomes folded envelopes through folding work; a courier carries them. There is one 15-minute slot, and Lou chooses one activity: folding 15 minutes, sorting 10, decorating 15; Lou ranks decorating, folding, sorting. Lou has an imaginary gold sticker and prefers silver; Min has silver and prefers gold. Explain a good and a service, Lou’s feasible choice and next-best alternative, and the proposed sticker swap.

Work on paper or in your own document. Explain the choices you made.

  • Identify a physical product and work.
  • Check activities against the 15-minute limit.
  • Name Lou’s choice and next-best feasible alternative.
  • Trace both sides of the imaginary swap and use both preferences.
Compare with a model response

An envelope is a good; folding it or carrying it is a service. All three activities fit, so Lou chooses decorating. Folding is Lou’s next-best feasible alternative given up. In the swap Lou would receive silver and Min gold, which match both stated preferences if both agree.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.