A farm is growing corn in 2 fields. One of the fields has 13 full rows of corn cobs, and the other field has 16 full rows of corn cobs. If each row contains 4 corn cobs, how many corn cobs has the farm grown?
In the first field, there are 13 rows * 4 corn cobs/row = 
<gadget id="calculator">13*4</gadget>
<output>52</output>
52 corn cobs.
In the second field, there are 16 rows * 4 corn cobs/row = 
<gadget id="calculator">16*4</gadget>
<output>64</output>
64 corn cobs.
So the farm has grown a total of 52 corn cobs + 64 corn cobs = 
<gadget id="calculator">52+64</gadget>
<output>116</output>
116 corn cobs.

<result>116</result>