Question:
50 power of 20 X 20 power of 50?

How many zero can be found in the answer and why?

Hi,

I want to write ^ to designate powers so I will write 50^20 for 50 power of 20.
(50^20)(20^50)
= (5^20)(10^20)(2^50)(10^50)
= (5^20)(2^20)(2^30)(10^20)(10^50)
= (2^30)(10^20)(10^20)(10^50)
= (2^30)(10^90)

Since no power of two ends with a zero the number of zeros in (50^20)(20^50) is 90.

Cheers,
Penny