Solving the Mystery of the Missing Numbers

Khan Academy

This engaging animated math video presents a narrative-driven problem solving task featuring Sal, Esther, and a mischievous character named 'Ben Eater the Number Eater.' The central premise involves a standard number grid (1-90) where several numbers have been 'eaten' (erased), prompting the characters to use various mathematical strategies to restore the grid. The video models collaborative problem solving and explicitly encourages viewer participation by asking them to pause and think.