quantitative reasoning

A very small number.

(.3)^264  =  (3/10)^264  =  (3^264) / (10^264)

My calculator won't calculate (.3)^264 and it won't calculate (.3)^264 , so I'll need to use a smaller number.

You can use the calculator to get 3^132, which is approximately 10^63.   (Check this out.)

3^264 ≈ (3^132)^2             (When you have an exponent to an exponent, you multiply the exponents)

           ≈ (10^63)^2 

           ≈ 10^126

(3^264) / (10^264) ≈ (10^126) / (10^264)  ≈  10^ -138