The research says the best way to make your school better is to encourage teachers to participate in professional learning teams that unpack the standards to determine what each student should learn and how the learning will be measured, build a useful warehouse of evidence that learning is occurring, and critically review data collected to determine useful instructional strategies versus ineffective strategies.

If you are looking for a measuring and density activity that will be challenging, allow students to experience success early on and can be boxed up to use again, you might consider trying the activity that I am sharing in this post.  

I want to share a measuring activity for you to consider. First, start with two baseballs. The first baseball is a regular baseball. The other baseball is called a "small ball". Next, get six to eight students to volunteer. Without talking at all the students must hold the normal baseball and the small ball. They then must decide if the normal ball has more, less or the same mass as the small ball.

The Teacher Page includes all of the notes needed to set up, run, and clean up the particular experiment. It includes a record of where the lab was obtained, a list of chemicals including amounts and their location in the stockroom, notes of any issues experienced (good & bad) and notes of things that might be tried in the future. This will save you much time and repeated effort!