9. (3 points) A natural number that can only be divided by 1 and itself is called a prime number, such as: $2,3,5,7$, etc. Then, the prime number greater than 40 and less than 50 is $\qquad$, and the largest prime number less than 100 is $\qquad$.
【Analysis】According to the concept of prime numbers: in a natural number greater than 1, a number that has no divisors other than 1 and the number itself; then list the prime numbers that are greater than 40 and less than 50;

To find the largest prime number less than 100, start from the largest number within 100: $99, 98$ are composite numbers; thus, the conclusion can be drawn.
【Solution】Solution: The prime numbers greater than 40 and less than 50 are: $41, 43, 47$;
The largest prime number less than 100 is 97;
Therefore, the answers are: $41, 43, 47, 97$.