This is an activity for young students who have never had experience filling in bubbles on standardized tests. They practice shading in bubbles of different shapes and sizes. In my class, we make it a little contest to see who can have the best looking bubbles. You can explain to the students that machines grade their bubble answer sheets and why it is important to do it correctly. This small mini-lesson can help make sure that your students know how to accurately fill in bubbles on those high-stakes tests.