My mystery number A gold star indicates high-quality, inquiry-based activities that follow the PhET design guidelines.


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Tittel My mystery number
Omtale This activity focuses on understanding numerals as representing objects or sets of objects. It addresses the distinction between using place value and not using place value. For example, in the image above, 1 and 2 are placed next to each other. This means that one puppy and two puppies are hiding. The total number of puppies hiding is three, not twelve.
Emne Matematikk
Nivå Barneskule
Type Demonstrasjon, Guided Activity
Tid 30 minutt
Inneheld svar Nei
Språk English
Nøkkelord 1:1 correspondence, cardinality, counting, place value
Simuleringar Number Play (HTML5)


Forfattarar Ian Whitacre, Dom Carorora, Azar Kamaldar
Skule / Organisasjon Florida State University
Lasta opp 11.09.23
Oppdatert 14.10.23