Evaluate:

By prime factorization method we get;


2



8000



2



4000



2



2000



2



1000



2



500



2



250



5



125



5



25



5



5




1



8000 = 2 ×2 ×2 ×2 ×2 ×2 ×5 ×5 ×5


= (2 ×2 ×2) × (2 ×2 ×2) × (5 ×5 ×5)


= 23 × 23 × 53


= (2 ×2 ×5) = 20


7