# Open a ten, keep the amount: complete description

Top standard account: three verified ten-strips (each ten separate cells) and two loose circles, labelled thirty plus two equals thirty-two. Bottom nonstandard account: two ten-strips and twelve loose circles, labelled twenty plus twelve equals thirty-two. These are two representations of ONE original collection; the old strip is removed when its singles replace it. Bottom empty own exchange region has no answer.

[Original SVG](../aids/open-ten.svg). Use suitable tactile/large pieces or directed adult movement if useful. A supplied account is a model, not an independently created answer.

Original SubjectNest teaching and drawings © NeuroForgeIO Pty Ltd 2026, [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Credit SubjectNest by NeuroForgeIO Pty Ltd, version 0.1.0, source and licence; note changes. Curriculum and provider rights remain separate.