Exercise 6.3.2
1.What is the sum of any two Numbers
2.State whether the following statements are True or False
3.The numbers 13 and 31 are prime numbers Both these numbers have same digits 1 and 3.Find such pairs of prime numbers upto 100.
- Prime numbers are the numbers which have only two factors, the number itself and 1
- Let's recall all the prime numbers from 1 to 100.
- As Similar from 30 to 40
, . - And from 70 to 80
, .
4.Write down separately the prime and composite numbers less than 20
- Prime numbers are the numbers which have only two factors, the number itself and 1
- prime Numbers between 1 and 10 are 2,
, , . - And from 10 to 20
, , , . - Composite Numbers between 1 and 10 are
, 6, , , 10. - And from 10 to 20
, , 15, , .
6.Express the following as the sum of two odd primes
7.Give three pairs of prime numbers whose difference is 2.
Hint:Two prime numbers whose difference is 2 are called twin primes.
Example:[3,5]
1.(
2.(
3.(
8.Which of the following numbers are prime?
9.Write seven consecutive composite numbers less than 100 so that there is no prime number between them.
90's series:
10.Express each of the following numbers as the sum of three odd primes.
11.Write five pairs of prime numbers less than 20 whose sum is divisible by 5.
: 2 +
:
: 3 +
: 5 +
:
- Fill in the blanks :
(a) A number which has only two factors is called a
(b) A number which has more than two factors is called a
(c) 1 is neither
(d) The smallest prime number is
(e) The smallest composite number is
(f) The smallest even number is