Question

What is the product of all positive divisors of $100$?

Answer 1

1,2,4,5,10,20,25,50,100 are all the positive divisors of 100. However, rather than straight up multiplying them in random order, I will multiply the opposite ends with each other (100*1, 2*50, 4*25, 5*20) and then multiply 10. 
100*1=100
2*50=100
4*25=100
5*20=100
100*100*100*100*10= 1,000,000,000

 Answer: 1,000,000,000