SOLUTION: How do I explain how to write this in exponential form in the easiest way possible such that a 5th grader can understand? There were five bacteria in a dish at the beginning of

Question 1126204: How do I explain how to write this in exponential form in the easiest way possible such that a 5th grader can understand?
There were five bacteria in a dish at the beginning of an experiment. Every 15 minutes the bacteria in the dish tripled. Write in exponential form, the number of bacteria in the dish three hours after the experiment began.
Please note : It doesn't ask for the final answer,just to express it in exponential form.
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
Note that four of 15 minutes make one whole hour.
3 hours is three multiplied by four; to count number of 15-minute time periods.

A few parts here are omitted but you can fill them in yourself.
the character, ^, means that the number after it is as an exponent.

Number                    Expression for
of                        Number of           Exponential 
15-Minute Periods         Bacteria            Form
0                          5
1                         5*3                 5*3^1
2                         5*3*3               5*3^2
3                         5*3*3*3              .
4                         5*3*3*3*3            .
5                         5*3*3*3*3*3          .
.
.
12 (three hours)

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