Eddy’s spider plant produces 2 baby plants 2 times a year.  After 4 years, how many baby plants will the mother plant have produced?
The mother plant produces 2 baby plants 2 times a year so it produces 2*2 = 
<gadget id="calculator">2*2</gadget>
<output>4</output>
4 plants a year.
It produces 4 plants a year so after 4 years it will produce 4*4 = 
<gadget id="calculator">4*4</gadget>
<output>16</output>
16 baby plants.

<result>16</result>