A new B case: later thinking

A different model has five verified ten-strips and eight loose marks. Each strip has ten countable cells. Replacement singles are available. No whole or completed exchange answer is printed.

Original source aid · Full source description.

  1. What is one full strip worth?
  1. What whole do these strips and singles show?
  1. Replace one ten-strip with singles. Show the new parts.
  1. How do you know the amount stayed the same?

Keep your first idea before help. You can point, select, speak, sign, use AAC or direct an adult’s marks/moves. Tell the grown-up if the amount or layout needs changing.

Grown-up help

Use after Day 50 as appropriate. Empty own response and separate key have different roles. Fresh preparation and eligibility. Source givens, adult movements, mathematical hints and actual smaller ranges are named. This is a formative case, not secure or a whole-year grade.

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.