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


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Sernav My mystery number
Danasîn 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.
Mijar Bîrkarî
Ast K-5
Cure Guided Activity, Pêşkêşî
Dem 30 xulek
Bersîvan Dihewîne Na
Ziman Îngilizî
Peyvên Girîng 1:1 correspondence, cardinality, counting, place value
Şêwekar Number Play (HTML5)


Nivîskar Ian Whitacre, Dom Carorora, Azar Kamaldar
Dibistan / Organîzasyon Florida State University
Şandin 9/11/23
Rojanekirin 10/14/23