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Problem 1 · The Museum DisplayOnly the worksheet will be included when you print.
MathJewels.com
Name
Date

The Museum Display

Jewel value 2 jewels

The museum has 6 display cases. Each case begins with 4 rubies. Two of the display cases also get 3 sapphires each.

Just before opening, the curator removes 5 jewels to polish them.

One case × 6
Extra jewels × 2
− 5

Your challenge

How many jewels are left in the display cases?

Show your answer

Show an equation for each step, then explain how you checked your answer.

Show your work

Teacher & family guide

Difficulty & skills

Grade 3 · Number and operations · Whole-number operations · Equal groups

MJ 3.3 · C2 · W2

MathJewels rates content readiness, problem-solving challenge, and workload separately. These estimates describe the easiest reasonable solution path and do not reveal the solution.

Content level

MJ 3.3

Grades 3–5

Grade 3 progression · point 3

Likely range
MJ 3.0–3.6
Confidence
82%

Challenge

C2 · Standard

The solver chooses and coordinates familiar methods.

  • Method selection1
  • Reasoning depth2
  • Novelty0
  • Constraint management1
  • Proof or justification1

Workload

W2 · Moderate

Several coordinated calculations, representations, or explanation steps.

Active time
4–11 minutes · typically 7
Response
Short Explanation
Known-method steps
5
  • Mechanical execution1
  • Written output2
  • Representation production1
  • Bookkeeping1

Learning focus

Skills this problem practices

What a successful response demonstrates, with each skill’s share of the content rating.

  • Multiply equal groups

    Represent and solve whole-number situations made from equal groups, including choosing and evaluating a multiplication equation.

    • Independent mastery
    • 30% focus
    • MJ 3.2 milestone

  • Add and subtract quantities

    Combine and compare whole-number quantities in contextual problems and use addition or subtraction to find an unknown result.

    • Fluent mastery
    • 20% focus
    • MJ 3.2 milestone

  • Solve a multi-step word problem

    Organize a contextual problem into an ordered sequence of operations, carry out the steps, and check that the result fits the situation.

    • Developing mastery
    • 50% focus
    • MJ 3.3 milestone

Readiness

Helpful prerequisites

Skills the rating assumes are already available to the learner.

  • Multiply equal groups

    Represent and solve whole-number situations made from equal groups, including choosing and evaluating a multiplication equation.

    • Independent readiness
    • Required
    • MJ 3.2 milestone

  • Add and subtract quantities

    Combine and compare whole-number quantities in contextual problems and use addition or subtraction to find an unknown result.

    • Fluent readiness
    • Required
    • MJ 3.2 milestone

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