In the next activity, students are asked to look for a rule that puts together some numbers to make a target number. This Warm-up activates that sort of thinking.

Ask students to share their expression with a partner, so that their partner can verify that their expression is equal to 24. Then, select a few students to share their expression with the whole class and record these for all to see. How many different ways did the class find to make 24?

In this activity, students experiment with an applet in which the value displayed in some cells depends on other cells. Monitor for students who notice interesting things.

Instead of writing down responses to the questions, it would make sense for students to share their observations verbally with a partner.

Some students will probably notice that the answers are in the spreadsheet. For example, if you click on cell B2, you can see the formula that was used to generate the number that appears in that cell. They should be encouraged to use the values of the other cells to verify what they notice. Ultimately, all students should be able to interpret the spreadsheet formula in the cell.

In the digital version of the activity, students use an applet to discover the formulas within spreadsheet cells. The applet allows students to work with a Geogebra spreadsheet directly. Use the digital version if it is available so that students are more familiar with Geogebra.

The purpose of this activity is to improve student familiarity with writing spreadsheet formulas based on references to other cells. In this activity, students have an opportunity to write their own spreadsheet formula in a cell and trade with a partner to guess their formula.

In the digital version of the activity, students use an applet to play with formulas in a spreadsheet. The applet allows students to directly manipulate the formulas and see the results immediately. Use the digital version if it is available so that students can be familiar with the spreadsheets available to them in this course.