有關數學問題 - 唔明請幫忙

1. What is the sum of all the prime number between 80 and 90 ?

2. What is the difference between the largest and smallest prime numbers
between 90 and 120 ?


3. What is the sum of all the composite numbers between 43 and 51 ?


4. What is the difference between the largest and smallest composite
number between 57 and 73 ?

5. What is the product of the smallest prime number and the largest
composite number between 37 and 87 ?

6. What number is neither a prime nor a composite number ?


7. What is the smallest prime number after 101 ?

8. Is 2 a composite number ?


9. Find the composite numbers from the following : a) 12 , 31 , 35