Answer :

One mile= 5,280 feet

Then you multiply that by 3 to get 15,840 feet.  To cover that extra 1/2 mile, you divide 5,280 by 2 to 2,640 ft.  

Finally you add 15,840 to 2,640 to get a total of 18,480 ft.
altavistard
Convert: 3 ½ mi = ____ ft.
                                                                     5280 ft
I'd prefer to use a conversion factor:   1 = --------------
                                                                      1 mile

Thus,


3 1/2 miles      5280 ft
---------------- * ------------ = 18480 ft (answer) 
           1            1 mile

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