What number is obtained by adding the units digits of 734^98 and 347^82? Choices:  A) 11  B) 12  C) 13  D) 14  E) 15
The units digit of 734^98 is 6 because 4 raised to the power of an even integer ends in 6.   The units digit of 347^82 is 9 because powers of 7 end in 7, 9, 3, or 1 cyclically. Since 82 is in the form 4n+2, the units digit is 9.   Then   6+9= 
<gadget id="calculator">  6+9</gadget>
<output>15</output>
15.   The answer is 15.
<result>E</result>
What number is obtained by adding the units digits of 734^98 and 347^82?