This is a great way to get your grade 1 students to discover and discuss patterns. The problem takes 45 minutes and is intended to engage the full spectrum of student ability - from those struggling with patterns, to those top quality problem solvers. I have not yet raised the $1,000,000 to support the prize money, but MathPickle will offer a $100 prize on the first March 14th in which I have at least 10 submissions from different schools. Submissions should be stories or photographs showing this gem of a problem being used in the classroom.
Email submissions to firstname.lastname@example.org with the subject matter "No-Three-In-A-Line $100 challenge."
All entries may be used in an updated version of this pdf file and to spread knowledge of this awesome problem. Please do not submit a photograph of students who do not have parental consent to have their image used in this way.