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