Combinatorics Counting List

Problem pool

Core · Canonical TaskForm · Place-value property case-count entry · Enter Value

Watch: Count values in a finite range that satisfy a digit or place-value predicate and enter the exact cardinality. The shell keeps the complete question visible, reserves the canonical reply band, and reveals proof on the same task objects.

Misread: Child action: Count values in a finite range that satisfy a digit or place-value predicate and enter the exact cardinality.

Curriculum: Mapped to Combinatorics Counting List.

Combinatorics Counting List practice with visual examples, common slips, and next-step routes.

Surface

This skill appears in Systematic list tray build, List missing or duplicate repair, Tree diagram branch read-build, Casework cover board, Place-value property case-count entry, Bounded semantic rubric response, Hidden spatial ordinal entry, Bounded reasoning proof workspace, Map-scene clue relation choice, Switch-bulb one-visit identification, Constraint construction token board, Constraint table composer state, Embedded-graph predicate panel choice, Equal-sum pair omission choice, Finite-constraint entailment choice, Region-doorway trail-start choice, Symbol-strip deletion middle token, Card-operation move-count pair choice, Path direction-marker count entry, Rule-table and slot-constraint choice, Layered-path consistency proof, Transport-crossing sequence proof, Word-ladder path or no-path proof.

Task formats

Bounded reasoning proof workspace

Bounded reasoning proof workspace asks the player to assemble or enter an ordered, editable sequence of claim-and-reason steps that establishes a bounded mathematical characterization from declared givens, then submit the exact terminal family/value fields.

ActionAssemble or enter an ordered, editable sequence of claim-and-reason steps that establishes a bounded mathematical characterization from declared givens, then submit the exact terminal family/value fields.
CheckComplete the bounded reasoning proof workspace action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Bounded semantic rubric response

Bounded semantic rubric response asks the player to submit a concise explanation using the required mathematical claims, relations, or evidence tags in a bounded response schema.

ActionSubmit a concise explanation using the required mathematical claims, relations, or evidence tags in a bounded response schema.
CheckComplete the bounded semantic rubric response action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Card-operation move-count pair choice

Card-operation move-count pair choice asks the player to determine the exact numbers of allowed swaps and flips in an exactly-three-move solution, then choose the ordered pair (swaps, flips).

ActionDetermine the exact numbers of allowed swaps and flips in an exactly-three-move solution, then choose the ordered pair (swaps, flips).
CheckComplete the card-operation move-count pair choice action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Casework cover board

Casework cover board asks the player to cover all cases with chips and mark missing, duplicate, or impossible cases.

ActionCover all cases with chips and mark missing, duplicate, or impossible cases.
CheckComplete the casework cover board action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Constraint construction token board

Constraint construction token board asks the player to place every required token on the board so the completed state satisfies all visible constraints.

ActionPlace every required token on the board so the completed state satisfies all visible constraints.
CheckComplete the constraint construction token board action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Constraint table composer state

Constraint table composer state asks the player to complete or compose the table so every row, column, and stated relation satisfies the visible constraints.

ActionComplete or compose the table so every row, column, and stated relation satisfies the visible constraints.
CheckComplete the constraint table composer state action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Embedded-graph predicate panel choice

Embedded-graph predicate panel choice asks the player to inspect exact graph panels and choose the single panel whose topology satisfies the stated object-relation predicate.

ActionInspect exact graph panels and choose the single panel whose topology satisfies the stated object-relation predicate.
CheckComplete the embedded-graph predicate panel choice action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Equal-sum pair omission choice

Equal-sum pair omission choice asks the player to pair the values to a common sum and choose the one omitted value that makes a complete equal-sum pairing possible.

ActionPair the values to a common sum and choose the one omitted value that makes a complete equal-sum pairing possible.
CheckComplete the equal-sum pair omission choice action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Finite-constraint entailment choice

Finite-constraint entailment choice asks the player to use the explicit finite constraints to determine which target proposition holds in every valid assignment, then choose that proposition.

ActionUse the explicit finite constraints to determine which target proposition holds in every valid assignment, then choose that proposition.
CheckComplete the finite-constraint entailment choice action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Hidden spatial ordinal entry

Hidden spatial ordinal entry asks the player to combine the tokenized spatial or ordinal clues without exposing the full hidden arrangement and enter the uniquely entailed ordinal or difference value.

ActionCombine the tokenized spatial or ordinal clues without exposing the full hidden arrangement and enter the uniquely entailed ordinal or difference value.
CheckComplete the hidden spatial ordinal entry action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Layered-path consistency proof

Layered-path consistency proof asks the player to submit either a complete first-to-last topological witness order or a shortest directed contradiction-cycle certificate for declared layered-path constraints.

ActionSubmit either a complete first-to-last topological witness order or a shortest directed contradiction-cycle certificate for declared layered-path constraints.
CheckComplete the layered-path consistency proof action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

List missing or duplicate repair

List missing or duplicate repair asks the player to mark duplicate, missing, or illegal cases in a list.

ActionMark duplicate, missing, or illegal cases in a list.
CheckComplete the list missing or duplicate repair action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Map-scene clue relation choice

Map-scene clue relation choice asks the player to use one exact route map plus named clues to choose the uniquely forced categorical location for the queried person.

ActionUse one exact route map plus named clues to choose the uniquely forced categorical location for the queried person.
CheckChoose the answer that matches the visible prompt.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Path direction-marker count entry

Path direction-marker count entry asks the player to trace the path using the exact direction markers and enter the number satisfying the requested turn or marker condition.

ActionTrace the path using the exact direction markers and enter the number satisfying the requested turn or marker condition.
CheckComplete the path direction-marker count entry action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Place-value property case-count entry

Place-value property case-count entry asks the player to count values in a finite range that satisfy a digit or place-value predicate and enter the exact cardinality.

ActionCount values in a finite range that satisfy a digit or place-value predicate and enter the exact cardinality.
CheckComplete the place-value property case-count entry action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Region-doorway trail-start choice

Region-doorway trail-start choice asks the player to interpret a complete undirected regions-and-doorways graph and select the unique start region for a trail using every doorway exactly once and ending at a named region.

ActionInterpret a complete undirected regions-and-doorways graph and select the unique start region for a trail using every doorway exactly once and ending at a named region.
CheckChoose the answer that matches the visible prompt.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Rule-table and slot-constraint choice

Rule-table and slot-constraint choice asks the player to use the rule table and occupied value slots to choose the uniquely valid value or entity for the target slot.

ActionUse the rule table and occupied value slots to choose the uniquely valid value or entity for the target slot.
CheckComplete the rule-table and slot-constraint choice action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Switch-bulb one-visit identification

Switch-bulb one-visit identification asks the player to determine a legal ordered switch strategy and use the one inspection to identify the complete switch-to-lamp correspondence.

ActionDetermine a legal ordered switch strategy and use the one inspection to identify the complete switch-to-lamp correspondence.
CheckComplete the switch-bulb one-visit identification action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Symbol-strip deletion middle token

Symbol-strip deletion middle token asks the player to apply the ordered deletion rule to the symbol strip and enter the uniquely determined remaining middle token.

ActionApply the ordered deletion rule to the symbol strip and enter the uniquely determined remaining middle token.
CheckComplete the symbol-strip deletion middle token action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Systematic list tray build

Systematic list tray build asks the player to build an organized list of all valid cases using cards or chips.

ActionBuild an organized list of all valid cases using cards or chips.
CheckComplete the systematic list tray build action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Transport-crossing sequence proof

Transport-crossing sequence proof asks the player to construct and order a legal crossing sequence, then complete a bounded optimality-and-uniqueness certificate.

ActionConstruct and order a legal crossing sequence, then complete a bounded optimality-and-uniqueness certificate.
CheckComplete the transport-crossing sequence proof action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Tree diagram branch read-build

Tree diagram branch read-build asks the player to read or build branches representing all choices in order.

ActionRead or build branches representing all choices in order.
CheckComplete the tree diagram branch read-build action.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Word-ladder path or no-path proof

Word-ladder path or no-path proof asks the player to submit a valid finite word-ladder path under the declared mutation rule or a complete no-path certificate.

ActionSubmit a valid finite word-ladder path under the declared mutation rule or a complete no-path certificate.
CheckPick the path or next move that satisfies the rule.
UseSupport / Core / Transfer
ShowsCheck only
PresentationCompact / Standard / Extended

Practice focus

Word problems are confusing

Selection

Fresh independent work can move toward Core, Transfer, or Challenge routes; help use or confusion keeps support visible.

Help

Hints keep attention on the visible structure; reveals show the path without counting as independent evidence.

Presentation

Presentation can reduce reading and interaction load without changing the selected skill. Practice focus can bias compatible work without breaking prerequisites or story fit.

Story fit

  • story beats with visible logic state, manipulable evidence, and a bounded player action
  • Episodes whose mathematical action is count or optimize a finite combinatorial system using complete non-overlapping casework and a construction witness.
  • Contexts that preserve the canonical mathematical action without changing the response or answer rule.