Lesson 4 in a series of lessons creating a Theatre Booking System with Year 8 ICT students.

1. Theatre Booking System
Lesson 3: Using functions with
a theatre booking system

2. 1
1. Open up your spreadsheet.
2. In the Number column use
the COUNTIF function. This
counts how many of a
certain number there are in
a certain range – e.g.
=COUNTIF(B2:H11,1)

3. 2
The function I have entered is = COUNTIF(B2:H11,1)
Range Criteria
The first part of the function is the range. In the
example above it is B2:H11.
The second part of the function is the criteria. In the
example above it is 1.

4. 3
Now that we have worked out the number of each type
of ticket sold, it is time to work out how many we have
sold altogether.
To do this we use the SUM function. This is what has
been entered in cell M9 in the above example.

5. 4
The function I have entered is = SUM(M3:M6)
Range
If you enter a function similar to the one above you
should find that your spreadsheet adds up and
displays the total for the range you have specified.
Make sure your SUM function adds up the number of
tickets sold!

6. 5
Now that we know how many of each type of ticket we
have sold and how many in total, it is time to find out
how much we have earned!
Revenue is a term which means the amount of money
made.

7. 6
The formula I have entered is = M3*L3
+ (add) - (subtract) * (multiply) / (divide)
To work out the revenue for each category, simply
enter the Price multiplied by the Number of tickets
sold.
Do the same for the Total.

8. 6
Make sure your ‘money’
cells are formatted
according to currency:
Format -> Cells -> Number