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:
91 x 91 x 91 x 91 x ... (for a total of 90 times) = 205932697769718720751022241537826273778798891204240902265410628405420007132080336454496428436199543177121610044893712595361216205973603618680995736875408745245417017286034468601
Therefore, 91 to the power of 90 is 205932697769718720751022241537826273778798891204240902265410628405420007132080336454496428436199543177121610044893712595361216205973603618680995736875408745245417017286034468601.