This lesson is optional because it provides instructions for using spreadsheets.

To engage in this lesson, students must have access to internet-enabled devices. Ideally, they should navigate to the digital version of the materials with the embedded applets. A direct link to each applet is also provided.

Students experiment by changing numbers in a provided spreadsheet and discover what it does and how. Then, they have an opportunity to write their own formula. When students observe the outcome of different inputs and then generalize the operations in the formula cell, they are expressing regularity in repeated reasoning (MP8).