Give guidance and feedback to students' plans, encouraging, refining, and helping them to be responsible for their own learning. Maintain high expectations for completion of chosen options. Summarize by reviewing the whole, bringing students "full circle" to the experience with which the learning began.
Make worksheets for each other.
Objective: To talk about making up problems of their own to try on each other. To make the learned material personal.
Activity: Have the children make up worksheets to try on each other. Now make toothpick structures on all problems from worksheets.