Grade Level(s): 2, 5
Computer for Presenter, Internet Connection, LCD Projector, Adobe Flash Player, Java Plugin
Keywords: subtraction, difference, puzzle, game,
Start with any side of the black square and click in the blank in the blue circle on that side and type in the difference of the black numbers on that side (subtracting the larger black from the smaller one). So if the black numbers on the top side of the black square were 7 and 12, one would type 5 (= 12 – 7) in the blue circle between the 7 and the 12. this is repeated through the four levels of the puzzle until complete. The numbers are generated by the computer or can be created by the user.
Source and Access Information
Name of Author/Source: Utah State University
Is this Resource freely Available? Yes
Access Privileges: Public
* Please note that examples of resources are not intended as complete curriculum.