During this Unit, students will perform activities and conduct experiments that will introduce them to the concept of using numbers when making and recording observations in the lab and when analyzing results from experiments. Through their explorations, students will come to a better understanding of different types of observations that can be made by counting objects, of ways by which samples collected in the lab can be compared, and of the use of addition and subtraction when performing experiments. In addition, they will have an opportunity to use three new tools in the lab and determine their functionality.