Toy Shop: Deriver

Activity Type: Computer Activity

Deriver +/- (Composing Numbers)
Deriver +/- (Adding/Subtracting)

Quick Description:

Help the twins get the same number of toys. Choose the numeral that shows the number of toys one twin needs to give the other.

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Special Thanks To

Institute of Education Sciences
The research reported here was supported by the Institute of Education Sciences, U.S. Department of Education, through grant numbers R305K050157, R305A120813, R305A110188, and R305A150243. to the University of Denver. The opinions expressed are those of the authors and do not represent views of the Institute or the U.S. Department of Education.