I use this worksheet during my 100th day celebration. I set up an estimation center for my students. During the center, they record the item name and circle their guess. When concluded, we open our bags, count, and see who was consistently the closest. I award that lucky student with a prize. I have attached my answer sheet to give you an idea of how I stuff my bags, but the great thing about this sheet, is you can decide what you want to use.