Are all worksheets created equally?

Worksheets get a bad reputation.  Worksheets based in recall do little to extend student thinking.  Mrs. Smith used this worksheet with her students today in math class.  How does this worksheet engage students in high-order thinking?  Is student learning centered on the answer or the process?

Answer Only

What would happen if you asked students to write their own word problems?  Ms. Bobcheck created a center called "Writing and Reading Word Problems."  In this center students were given an answer and they were asked to write a problem with that answer.  Why is this beneficial?  How could you use this in your classroom?