STEM Challenge, great for beginning of the year (or even end of year) activities! There are several adaptions to this activity to make work for your and your kids. It also comes with additional math extensions in geometry and personal finance!There is a response packet for each of the steps of the engineering design steps and questions of the extensions as well. It can take anywhere from 1-3 lessons to complete depending on how you want to do it. Please note this gives instructions and has works