Question

4. Write down separately the prime and composite numbers less than 20.
5. What is the greatest prime number between 1 and 10?
6. Express the following as the sum of two odd primes.
(a) 44 (b) 36 (C) 24 (d) 18
7. Give three pairs of prime numbers whose difference is 2.
[Remark: Two prime numbers whose difference is 2 are called twin primes).
Which of the following numbers are prime?
(a) 23 (b) 51 (c) 37 (d) 26
9. Write seven consecutive composite numbers less than 100 so that there is no prime
number between them.​

Answer 1

Answer:

4. Prime numbers- 2,3,5,7,11,13,17,19

Composite numbers- 4,6,8,9,10,12,14,15,16,18,

Answer 2

4.prime numbers - 2,3,5,7,11,13,17,19

Step-by-step explanation:

because they only have two factors 1 and number itself

composite numbers - 4,6,8,9,10,12,14,16,18,20