Worth sitting with for a few minutes before opening anything below.

A good dinner-table problem — the approach matters more than the answer.

Next week, a new one.

The problem changes every Monday. Twelve are in rotation, drawn from grades 6 through 8, so a family working through them meets systems of equations, rates, percent and proportional reasoning across a term.

Parents: more free grades 6–8 practice at the Middle School Success Center.