# Playing With Numbers – Class 8/MCQ

**CBSE CLASS 8 MATHEMATICS-**

**Playing With Numbers – Chapter 16 / MCQ**

**Multiple Choice Questions.**

**Choose the correct answer from the options given below:**

**1. Numbers can be written in general form. Thus a two digit number ab will be written as ab = —————**

A. 10a + b

B. 10b + a

C. a + b

**2. A three digit number abc made up of digits a, b and c is written as abc = ——**

A. a + 10b + 100c

B. 100a + 10b + c

C. 1000a + 100b + 10c

**3. A number is divisible by 10 when its one’s digit is ————–**

A. Zero

B. One

C. Two

**4. If the ones digit of a number is 0 or 5, then it is divisible by —————**

A. 2

B. 5

C. 10

**5. A number N is divisible by 9 if the sum of its digits is divisible by ———–**

A. 6

B. 9

C. 12

**6. If the three digit number 24x is divisible by 9, what is the value of x?**

A. 3

B. 6

C.9

**7. Which of the following numbers are not divisible by 9.**

A. 108

B. 432

C. 616

**8. Which of the following numbers are not divisible by 3?**

A. 108

B. 432

C. 616

**9. If 21y5 is a multiple of 9, where y is a digit, what is the value of y?**

A. 1

B. 2

C. 3

**10. What is the general form of the four digit number abcd?**

A. 1000a + 100b + 10c + d

B. a + 10b + 100c + 1000d

C. 10a + 100b + 1000c + d

**ANSWERS;**

**1. 10a + b**

**2. 100a + 10b + c**

**3. Zero**

**4. 5**

**5. 9**

**6. 3**

**(Since 24x is divisible by 9, sum of its digits = 2 + 4 + x should be divisible by 9.**

**i.e. 6 + x should be divisible by 9.**

**This is possible when 6+x =9 or 18……**

**But, since x is a digit, therefore 6+x =9**

**So x = 9-6 = 3)**

**7. 616**

**8. 616**

**9. 1**

**(Since 21y5 is divisible by 9, sum of its digits = 2+1+y+5 should be divisible by 9.**

**i.e. 8 + y should be divisible by 9.**

**This is possible when 8+y = 9.**

**But since y is a digit, therefore y= 9-8 = 1)**

**10. 1000a + 100b + 10c + d**