AXIOKids

Constraints Elimination

Constraints Elimination practice with visual examples, common slips, and next-step routes.

Surface

Children may meet this skill through task formats such as Clue-card candidate choice, Candidate elimination markboard, Violated-clue marker, Ambiguity repair clue choice, Minimal clue set choice, Order-slot deduction board, Mini logic grid mark-fill, Proof card evidence choice.

Task formats

Ambiguity repair clue choice

Ambiguity repair clue choice asks children to choose a clue action that changes an ambiguous clue set into a valid unique solution.

Child actionChoose a clue action that changes an ambiguous clue set into a valid unique solution.
CheckChoose the answer that matches the visible prompt.
UseSupport / Core / Transfer
ShowsCheck only
Age6-7 / 8-9 / 10-11

Practice focus

Word problems are confusing

Candidate elimination markboard

Candidate elimination markboard asks children to mark candidates eliminated by a highlighted clue or all clues.

Child actionMark candidates eliminated by a highlighted clue or all clues.
CheckComplete the candidate elimination markboard action.
UseSupport / Core / Transfer
ShowsCheck only
Age6-7 / 8-9 / 10-11

Practice focus

Word problems are confusing

Clue-card candidate choice

Clue-card candidate choice asks children to use clue cards to eliminate visible candidates and choose the single survivor.

Child actionUse clue cards to eliminate visible candidates and choose the single survivor.
CheckChoose the answer that matches the visible prompt.
UseSupport / Core / Transfer / Challenge
ShowsIndependent solve / Supported solve / Challenge ready
Age6-7 / 8-9 / 10-11

Practice focus

Word problems are confusing

Mini logic grid mark-fill

Mini logic grid mark-fill asks children to fill yes, no, or maybe marks in a small logic grid from clue cards.

Child actionFill yes, no, or maybe marks in a small logic grid from clue cards.
CheckComplete the mini logic grid mark-fill action.
UseSupport / Core / Transfer
ShowsCheck only
Age6-7 / 8-9 / 10-11

Practice focus

Word problems are confusing

Minimal clue set choice

Minimal clue set choice asks children to select the smallest sufficient clue set or mark a redundant or necessary clue.

Child actionSelect the smallest sufficient clue set or mark a redundant or necessary clue.
CheckComplete the minimal clue set choice action.
UseSupport / Core / Transfer
ShowsCheck only
Age6-7 / 8-9 / 10-11

Practice focus

Word problems are confusing

Order-slot deduction board

Order-slot deduction board asks children to place cards into ordered slots using relation clues.

Child actionPlace cards into ordered slots using relation clues.
CheckComplete the order-slot deduction board action.
UseSupport / Core / Transfer
ShowsCheck only
Age6-7 / 8-9 / 10-11

Practice focus

Word problems are confusing

Proof card evidence choice

Proof card evidence choice asks children to select the proof card that supports a visible claim.

Child actionSelect the proof card that supports a visible claim.
CheckChoose the answer that matches the visible prompt.
UseSupport / Core / Transfer
ShowsCheck only
Age6-7 / 8-9 / 10-11

Practice focus

Word problems are confusing

Violated-clue marker

Violated-clue marker asks children to given a proposed candidate or arrangement, mark the clue it breaks.

Child actionGiven a proposed candidate or arrangement, mark the clue it breaks.
CheckChoose the answer that matches the visible prompt.
UseSupport / Core / Transfer
ShowsCheck only
Age6-7 / 8-9 / 10-11

Practice focus

Word problems are confusing

Selection

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

Help

Hints keep the child oriented to the visible structure; reveals show the path without counting as independent evidence.

Age

Age changes presentation, reading load, and dignity of the screen. 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 child action