1. Notice this digit: 1,1,2,3,5,... What's the next 10 digits of it?
2. 1/2, 1/3, 1/4, 1/5,... what's the next increasing fraction?
3. What digit has the most divisibility of all one-digit number?
4. What is the first digit that when you divide it inexactly, it will leave you decimals, even changing the value? Note that 2 isn't this digit, because 5/2 = 2.5. It can still be an exact decimal.
5. What digit, if you have twice of it, you get more than 5 divisible numbers of it?