What is a Three Act Task?
It is a lesson structure in which there are three parts (or acts). It creates an opportunity for students to become interested in modeling an accurate estimation/solution without the unnecessary myopic focus on the "right" answer.
Here is a beautiful description (with examples) of Three Act Tasks with elementary students. Give a Three Act Task a try with your students!
Here is another very detailed walk-through of the Three Act Task structure. (From the inventor of the Three Act Task himself!)
If you have any questions, thoughts, or concerns, please contact Duane: firstname.lastname@example.org