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LESSON 3-7 AND 3-8 Variables and Formulas in Spreadsheets

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SPREADSHEETS: A BASIC HISTORY Spreadsheets got their names the ledger (record) sheets used to keep financial records. These sheets were often large pages, folded and taped together that had to be spread out for review. Electronic (computer based) spreadsheets have been available for over 30 years, making the process much easier, quicker and often more accurate.

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SPREADSHEETS: THE PARTS…CELLS Each individual box of a spreadsheet is called a cell. Cells are named by identifying the column name and then the row name. Example: The highlighted cell is named A1 Cells contain individual data points, text, formulas that will calculate new data, or remain empty. When one cell’s data is changed, it may change the data in other cells as well.

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THE PARTS CONTINUED: COLUMNS VS. ROWS COLUMNS: VERTICAL (letters) This is Column A ROWS: HORIZONTAL (numbers) This is Row 3

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HOW TO WRITE FORMULAS IN SPREADSHEETS Different computer programs may have slightly different ways to enter formulas into a spreadsheet, but the basics are this: Use the cell names to identify which data points are to be calculated. Use the function symbol of what you want it to do (+, -, *, /). Identify the cell in which you want the final calculation to appear by using “cell name=“

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FORMULAS IN ACTION This spreadsheet shows the records of books sold during a fund raiser by 4 different students. To find the total number of books sold by all 4 students, you would add up the data in cells B2, B3, B4 and B5. The formula used to tell the computer to do this for you would be: B6=B2+B3+B4+B5 B6 is the name of the cell where to total would appear. B2 through B5 are the cells containing the data to be added.

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MORE FORMULAS To find total amount of money raised by each student you would use the following formula. Given the data that each book earns $2.50… C3=B3*2.50 C3 is the cell where the money earned total would appear. B3 is the number of books sold by Robin 2.50 is the amount earned by each book. Notice, we do not include words or unit symbols in the formula.

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NOW YOU TRY IT (PART 1) Complete Study Link 3-7 (see next slide for more directions!)

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NOW YOU TRY IT (PART 2) On the back of your Study Link, answer these questions: Bring this completed to class tomorrow!

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