Question

3.The numbers 13 and 31 are prime numbers. Both these numbers ha
4. Write down separately the prime and composite numbers less than
and 3. Find such pairs of prime numbers upto 100.
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 twis
8. 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 tha
number between them.​

Answer 1

3. 13,17,19,23,31.

4.Prime- 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. Composite - 4 , 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28.

5. 7

6.a)41+3=44

b)31+5

c)22+2

d)10+8

7. (5, 7), (11, 13), (17, 19).

8.(a)23 , 23 has only two factors , 1 and 23 therefore , it is prime number.

(b) 51 has 1, 3, 17 , 51 , not prime number

(c) 37 has 1 and 37 , it is prime number

(d) 26 has 1, 2, 13 , 26, not prime number.

9. 90,91,92,93,94,95,96.

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