1. Lessons 3: Coffee Shop Inventory
Unit 1: Using Functions
and Formulas
Lessons 3: Coffee Shop Inventory

2. Lesson 3: Coffee Shop Inventory
Objectives:
Open and move an existing Google Sheets file in Google Drive
Understand the parts of a function
Learn common functions (Sum, Average, Min and Max)
Understand the IF conditional function
Use functions in a spreadsheet

3. What is a Function?
Functions are pre-defined formulas that perform common calculations
When the values used in a function change, the spreadsheet automatically recalculates the value
Ask students if they can determine how a function is different from a formula.

4. Writing a Function A function typically has three parts: Equal sign
Function name
Arguments

5. Equal Sign
An equal sign indicates the spreadsheet should perform a calculation. Every function must start with an equal sign.

6. Function name
The function name indicates the operation to preform, such as SUM or AVERAGE.

7. Arguments
The arguments are values, such as a range of cells, used to calculate the function’s value. Not all functions have arguments - e.g. TODAY().

8. Common Functions- SUM
Before revealing, ask students what they think the SUM function might be used for.

9. Common Functions- SUM
The SUM function adds a range of cells.

10. Common Functions- AVERAGE
Before revealing, ask students what they think the AVERAGE function might be used for.

11. Common Functions- AVERAGE
The AVERAGE function adds a range of cells and then divides the number of cell entries to find the average value.

12. Common Functions- MIN
Before revealing, ask students what they think the MIN function might be used for.

13. Common Functions- MIN
The MIN function returns the smallest number from a range of cells.

14. Common Functions- MAX
Before revealing, ask students what they think the MAX function might be used for.

15. Common Functions- MAX
The MAX function returns the largest number from a range of cells.

16. IF Functions
The IF function’s structure is an equal sign, function name (IF) and three arguments; a logical expression, and two values
A logical expression is an expression that evaluates to either TRUE or FALSE.

17. IF Functions Logical expressions can contain: Cell references  C4
Text  “Empty”
Numbers  19
Formulas  =(C3+12)/3
Functions  AVERAGE(B2:B12)

18. IF Functions
=IF(logical_expression, true_value, false_value)
A spreadsheet calculates the value of an IF function by first evaluating the logical expression.
If the expression is TRUE, then the first value in the function is used.
If the expression is FALSE, then the second value in the function is used.

19. Ways to Enter Functions
1. Type in the function, and then highlight the cells to fill in the function’s range.
2. Use the function command, under the insert tab.