# Question Posing

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8/22/2011
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```							                                  Posing Powerful Questions

Goal(s) for a Specific Lesson                                                                         Grade
◦ Students will explain with justification how simple interest amounts are affected when one of
the variables in a simple interest calculation is changed.                                          MEL3E

Curriculum Expectation(s) – Saving, Investing, and Borrowing 2.1
◦ Determine, through investigation using technology (e.g., calculator, spreadsheet), the effect on simple
interest of changes in the principal, interest rate, or time, and solve problems involving applications of
simple interest

Big Idea(s) addressed by the expectations
◦ BI 2 – Limited information about a number or numerical relationship sometimes, but not always, allows
us to predict other information about that relationship
i.e. Sometimes if you know a little bit about a number or a number relationship, you know more
than you realized.

Parallel Question
You are thinking about investing \$6000 for 2 years in an account paying interest at the rate of 4%
per year.

Option 1: How will the amount of interest you earn be affected if you double one of the variables -
either the Principal, the rate, or the time?

Option 2: How will the amount of interest you earn be affected if you double any two of the
variables - Principal, rate, or time?

Option 3: How will the amount of interest you earn be affected if you double all of the variables –
Principal, rate, and time?

Sample Consolidation Question
Create an example to show how you could change one of the variables in a simple interest
calculation to triple the amount of the interest earned.

```
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