Here are 5 word problems with prompts for the student to create a written response. When I started I was trying to do one response per day at a 20 minute center. This created an awful lots of grading for me as I teach 3 math classes. I later assigned between 1 and 3 responses per week depending on ability level, created a rubrics, and had them self evaluate and buddy evaluate. This year I will be putting the question in a plastic sleeve and they will respond on notebook paper in their center folder. It will save a lot of copies.