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


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Pealkiri My mystery number
Kirjeldus 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.
Õppeaine Matemaatika
Tase K-5
Tüüp Demonstratsioon, Guided Activity
Kestus 30 minutit
Koos vastustega Ei
Keel inglise
Võtmesõnad 1:1 correspondence, cardinality, counting, place value
Simulatsioonid Number Play (HTML5)


Autorid Ian Whitacre, Dom Carorora, Azar Kamaldar
Kool / Organisatsioon Florida State University
Sisestatud 11.09.23
Uuendatud 14.10.23