Tom dances 4 times a week for 2 hours at a time and does this every year for 10 years.  How many hours did he dance?
He dances 4*2=
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 hours per week.
He dances for 52*10=
<gadget id="calculator">52*10</gadget>
<output>520</output>
520 weeks.
So in total he danced for 8*520=
<gadget id="calculator">8*520</gadget>
<output>4_160</output>
4160 hours.

<result>4_160</result>