Jack has been driving for the past 9 years. He drives 37,000 miles every four months. How many miles has Jack driven since he started driving?
There are 12/4 = 
<gadget id="calculator">12/4</gadget>
<output>3</output>
3 four month groups in a year.
Jack drives 37,000*3 = 
<gadget id="calculator">37000*3</gadget>
<output>111_000</output>
111,000 miles in a year.
Jack has driven 111,000*9 = 
<gadget id="calculator">111000*9</gadget>
<output>999_000</output>
999,000 miles since he has started driving.

<result>999_000</result>