Problem 111 · The Missing RungPrint one blank worksheet now, download its PDF, or prepare a family or classroom packet.
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The Missing Rung

Complete to collectPolished Smoky QuartzLevel 3 · 5 Glints

Meditations on Oneness

Local folio mark · 111

Page 1 · Descend the product ladder

In an Archive field note, Luna fixes a nonzero real number . She lets be the product of copies of :

Every neighboring pair follows the same rule: .

A vertical product ladder descends through P3, P2, and P1 to a blank P0 rung. Each upward step is labeled multiply by a, and each downward step is labeled divide by nonzero a.
Write the value of on the missing rung only after you can prove it is forced.

Write on the missing rung. Use scratch paper for the proof.

  1. A missing rung lies below . Find the only value of that lets the same neighboring-rung rule hold at . Explain exactly where the condition is used.

Page 2 · Follow two echoes

Exponent notation

We write .

For , the quotient rule is .

Split a product

The product of a whole list equals the product of its left block times the product of its right block.

Use separate paper for your explanations.

  1. What must mean? Then check in two ways: as a nonzero number divided by itself, and using the exponent-division rule.

  2. To preserve the product-splitting rule when one block contains no factors, what must the product of the empty block be? Prove that no other value works.

______ product of the empty block = ______

Zero factors do not erase a product. They leave multiplication ready to begin.

At a glance

About this problem

These tags show what the problem is about and the math you’ll use. Choose one to find similar problems.

Theme

Skills

Grade

Math area

Topics

Is this a good fit?

Before you choose this problem

A plain-language look at readiness, thinking, time, and the expected response.

Math readiness

Designed for Grade 8 · Grade 9

Uses Late Grade 8 math.

Thinking

Stretch challenge

A nontrivial plan using familiar mathematical ideas.

Time & response

About 12–28 minutes

Moderate amount of written work · Proof response.

How to support: The common trap is to read zero factors as a zero result. Ask which value can sit before multiplication begins without changing the first factor.

Keep exploring

The Manyfold challenge 16 of 22

Technical reference

Rating, skills & curriculum

Designed for Grade 8 · Grade 9 · Uses Late Grade 8 math · About 12–28 minutes

Grade 8 · Grade 9 · Number and quantity · Exponents and magnitude notation

MJ 8.9 · C3 · W2

Precise MJD coordinates, factor scores, skill weights, calibration evidence, and curriculum crosswalks. This reference is available to everyone and is intentionally last.

Content level

MJ 8.9

Grades 6–8

Grade 8 progression · point 9

Likely range
MJ 8.9–8.9
Confidence
88%

Challenge

C3 · Stretch

A nontrivial plan using familiar mathematical ideas.

  • Method selection2
  • Reasoning depth2
  • Novelty3
  • Constraint management2
  • Proof or justification3

Workload

W2 · Moderate

Several coordinated calculations, representations, or explanation steps.

Active time
12–28 minutes · typically 18
Response
Proof
Known-method steps
12
  • Mechanical execution1
  • Written output3
  • Representation production2
  • Bookkeeping1

Learning focus

Skills this problem practices

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

  • Use and explain properties of integer exponents

    The learner can use and explain properties of integer exponents. This capability is distinct from mere exposure to or isolated use of whole-number exponents.

    • Transfer mastery
    • 100% focus
    • MJ 8.9 milestone

External alignment

Curriculum and standards crosswalks

Approved evidence-backed locations that support discovery. They do not define the MathJewels rating.

Common Core State Standards for Mathematics2010 · 1 location
Standards1 location · Representative: Know and apply the properties of integer exponents to generate equivalent numerical expressions.