Question

I Fill in the blanks :

1. _________ is a factor of every number.

2. The factor of a prime number is __________ and ____________.

3. A number which has more than two factors are called ___________.

4. The even prime number is ____________.

5. If a number ends with 0, it is divisible by _____________.

6. The smallest composite number is ____________.

7. ________ is neither prime nor composite.

8. A number is divisible by 6, if it is divisible by both ______ and ______.

9. The smallest even numbers is ______ and the smallest odd numbers is a

_______.

10. Sum of any two even numbers is ______.

11. Sum of any two odd numbers is _______.

12. The sum of any two consecutive odd numbers is always divisible by _______.

13. The greatest two digit prime number is ________.

14. The smallest two digit prime numbers is ________.

15. A prime number has only _______ factors.

II Solve all the following:

1. Write two prime numbers whose sum is 100.

2. Write a pairs of prime numbers whose sum is 75

3. Write a pair of prime numbers whose sum is 44.

4. Using divisibility test check whether the following are divisible by 9.

(a) 91800 (b) 31956 (c) 81615 (d) 61042 (e)48400 (f) 99909​

Answer 1

1. 1

2. 1 and itself

3. composite no.

4. 2

5. by 5 Or 10

6. 4

7. zero

8. 2 & 3

9. smallest even is 2 , odd is 1

10. an even no.

11. an even no.

12. by 4

13. 97

14. 11

15. 2 factors

II.

1. 49 + 51 = 100

and 29 + 71 .