H07 · A trade that keeps the amount

Try together: Model34 as3 tens4 ones; exchange one ten for10 ones:2 tens14 ones. Child chooses a different ordinary value and checks its total. Paper marks/words suffice; no money purchase or small-piece handling.

What this practises: Value-preserving partition. Keep actual child choices and adult handling/help separate. A few minutes or one question can be enough. No purchase, public sharing, personal information or returned activity is required.

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