The first step is to understand what it means when a number has an exponent. The “power” of a number indicates how many times the base would be multiplied by itself to reach the correct value.
The second step is to write the number in the base-exponent form, and lastly calculate what the final result would be. Consider the example of 2 to the power of 4: in exponent form that would be
So re-applying these steps to our particular problem, we first convert our word problem to a base-exponent form of:
To simplify this, all that is needed is to multiply it out:
18 x 18 x 18 x 18 x ... (for a total of 91 times) = 1697453806186006704858694343904967490988585705425128855098763390734638367485090533428659636022140751595384426463232
Therefore, 18 to the power of 91 is 1697453806186006704858694343904967490988585705425128855098763390734638367485090533428659636022140751595384426463232.