Make one valid and one faulty claim about a selected whole for a willing checker, or check them yourself. An ordinary starting amount is 35; smaller useful amounts are welcome. Use safe existing pieces, paper marks, tactile materials or direct the moves. Keep or revise your plan with a reason.
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Grown-up help
Look for justified verdict and a correction preserving the stated whole when a claim fails. A supplied example is 20 + 15 = 35; choose it as teaching support after an own attempt when useful. If every claim is changed, show a new valid and invalid small pair without error cues. If the reason is only looks wrong, match each claimed object to actual members before changing a label. [Full plan](../teacher/day-48.md). Count supplied versus actual materials separately; child-directed adult acts show mathematical choice without proving motor performance. No viewer, returned homework or fixed quota is required.Original SubjectNest teaching and drawings © NeuroForgeIO Pty Ltd 2026, CC BY 4.0. Credit SubjectNest by NeuroForgeIO Pty Ltd, version 0.1.0, source and licence; note changes. Curriculum and provider rights remain separate.