Curriculum Topics Covered
Multiples, following an algorithm, forming/solving simple equations.
See our Teacher Notes download for more information. The download Bar Code Trick Example gives an example that demonstrates the method for calculating the check digit, and the download Bar Code Trick Task Sheet contains activities for students.
Also, you can see a younger version of Matt performing the trick at 3:43 in this YouTube video: https://youtu.be/RP8jepN3zMc