# Class 6 Mathematics | Chapter 3 Playing With Numbers MCQ

Fill in the blanks.

1. ————- is a factor of every number.

A. 0

B. 1

C. -1

2. Number of factors of a given number are ————

A. Infinite

B. Finite

C. Zero

3. The number of multiples of a given number is —————

A. Infinite

B. Finite

C. Zero

4. A number for which sum of all its factors is equal to twice the number called a —————— number.

A. Real number

B. Perfect number

C. Rational number

5. The number which is not a perfect number is —————

A. 6

B. 28

C. 10

6. Numbers having more than two factors are called ——————

A. Prime numbers

B. Composite numbers

C. Perfect numbers

7. The numbers other than one whose only factors are 1 and the number itself are called ——————

A. Prime numbers

B. Composite numbers

C. Co – prime numbers

8. What is the greatest prime number between 10 and 20?

A. 19

B. 18

C. 17

9. The smallest composite number is ————-

A. 2

B. 3

C. 4

10. Two numbers having only 1 as a common factor are called ———- numbers.

A. Prime numbers

B. Composite numbers

C. Co – prime numbers

11. The LCM of 2 and 3 is ————-

A. 2

B. 3

C. 6

12. The HCF of 9 and 27 is ————-

A. 1

B. 3

C. 9

13. Which of the following statements are true?

A. If a number is divisible by 3, it must be divisible by 9.

B. If a number is divisible by 9, it must be divisible by 3.

C. A number is divisible by 18, if it is divisible by both 3 and 6.

14. Which of the following numbers are co-prime?

A. 2 and 4

B. 15 and 23

C. 9 and 27

15. A number which has either 0 or 5 in its ones place is divisible by———–

A. 3

B. 5

C. 10

**ANSWERS:**

1. 1

2. Finite

3. Infinite

4. Perfect number

5. 10

6. Composite number

7. Prime number

8. 19

9. 4

10. Co – prime numbers

11. 6

12. 9

13. If a number is divisible by 9, it must be divisible by 3.

14. 15 and 23

15. 5