Maths Quiz for Class 8 Playing with Numbers

Maths Quiz for Class 8 Playing with Numbers

In this post, we are providing 20 online maths quiz questions for class 8 playing with numbers. Online maths quiz will take around 20 minutes to complete it.

Question 1: If the hundreds, tens and ones digits of a 3-digit number are a, b and c, respectively, then the general form of the 3-digit number is __________.

A) 100c + 10b + a

B) 100b + 10c + a

C) 100a + 10b + c

D) 100c + 10a + b

Explanation: Hundreds digit = a, tens digit = b and ones digit = c. Number = a hundreds + b tens + c ones = a × 100 + b × 10 + c × 1 = 100a + 10b + c

Question 2: If cba is a 3-digit number, the its general form is ____________.

A) 100c + 10b + a

B) 100a + 10b + c

C) 100b + 10c + a

D) 100c + 10a + b

Explanation: The hundreds, tens and ones digits of cba are c, b and c, respectively. Therefore, its general form = c hundreds + b tens + a ones = c × 100 + b × 10 + a × 1 = 100c + 10b + a

Question 3: The difference between any 2-digit number and the number obtained by reversing its digits is always divisible by ________.

A) 9

B) 11

C) 5

D) 7

Explanation: The difference between any two-digit number and the number obtained by reversing its digits is always divisible by 9.

Question 4: The sum of a 2-digit number and the number obtained by reversing its digits will always be divisible by ____________.

A) 9

B) 11

C) 7

D) 13

Explanation: The sum of a 2-digit number and the number obtained by reversing its digits will always be divisible by 11.

Question 5: The difference between any 3-digit number and the number obtained by reversing its digits is always divisible by _________.

A) 13

B) 99

C) 17

D) 91

Explanation: The difference between any 3-digit number and the number obtained by reversing its digits is always divisible by 99.

Question 6: The sum of all the 3-digit numbers formed using the given three digits is always divisible by __________.

A) 39

B) 38

C) 37

D) 35

Explanation: The sum of all the 3-digit numbers formed using the given three digits is always divisible by 37.

Question 7: Which of the following digits cannot be the units digit of a square number?

A) 9

B) 8

C) 6

D) 4

Explanation: 8 cannot be the units digit of a square number.

Question 8: How many zeros can a square number have?

A) 1

B) 3

C) 5

D) 2

Explanation: A square number can have even number of zeros.

Question 9: If 37A + 214 = 5A3, then find the value of A.

A) 9

B) 8

C) 7

D) 6

Explanation: Since 37A + 214 = 5A3, then A + 4 = 3. Take A = 9, then 9 + 4 = 13. Write 3 in ones place and 1 carry over to tens place. Now, 1 + 7 + 1 = 9. Thus, A = 9.

Question 10: If A × A = 2A, then A = _______.

A) 3

B) 4

C) 5

D) 6

Explanation: If we take A = 5, then 5 × 5 = 25. Thus, A = 5.

Question 11: Write 487 in general form.

A) 8 × 100 + 4 × 10 + 7 × 1

B) 4 × 100 + 8 × 10 + 7 × 1

C) 7 × 100 + 8 × 10 + 4 × 1

D) 4 × 100 + 7 × 10 + 8 × 1

Explanation: 487 = 4 × 100 + 8 × 10 + 7 × 1

Question 12: Write 5 × 100 + 2 × 10 + 9 × 1 in numeral form.

A) 592

B) 529

C) 259

D) 925

Explanation: 5 × 100 + 2 × 10 + 9 × 1 = 529

Question 13: Which of the following numbers is divisible by 3?

A) 450921

B) 361270

C) 538024

D) 276103

Explanation: 450921 is divisible by 3, because 4 + 5 + 0 + 9 + 2 + 1 = 21, which is divisible by 3.

Question 14: Check which of the given numbers is divisible by 4 using divisibility test.

A) 507194

B) 248109

C) 375134

D) 910248

Explanation: 910248 is divisible by 4, because the number formed by its last two digits is divisibly by 4.

Question 15: Check which of the given numbers is divisible by 8 using divisibility test.

A) 590164

B) 267306

C) 952072

D) 318642

Explanation: 952072 is divisible by 8, because the number formed by its last three digits is divisibly by 8.

Question 16: Which of the following numbers is not divisible by 5?

A) 487560

B) 384129

C) 387565

D) 162830

Explanation: 384129 is not divisible by 5, because its units digit is 9.

Question 17: Which of the following numbers is divisible by 6?

A) 379104

B) 287650

C) 309621

D) 158426

Explanation: 3 +7 + 9 + 1 + 0 + 4 = 24, which is divisible by 3, so 379104 is divisible by 3. 379104 is divisible by 2 because its units digit is 4. Thus, 379104 is divisible by 6, because it is divisible by 2 and 3 both.

Question 18: Which of the given numbers is divisible by 9?

A) 188409

B) 487605

C) 351063

D) 520178

Explanation: 3 + 5 + 1 + 0 + 6 + 3 = 18, which is divisible by 9. So, 351063 is divisibly by 9.

Question 19: If 57x26 is divisible by 3, then find the smallest value of x.

A) x = 0

B) x = 1

C) x = 2

D) x = 3

Explanation: Since 57x26 is divisible by 3, its sum of digits should also be divisible by 3. Therefore, 5 + 7 + x + 2 + 6 = 20 + x. To make (20 + x) divisibly by 3, we need to take x = 1. Then, 20 + 1 = 21, which is divisible by 3. Thus, the smallest value of x is 1.

Question 20: If 475x09 is divisible by 9, then find the smallest value of x.

A) x = 0

B) x = 1

C) x = 2

D) x = 3

Explanation: Since 475x09 is divisible by 9, its sum of digits should also be divisible by 9. Therefore, 4 + 7 + 5 + x + 0 + 9 = 25 + x. To make (25 + x) divisibly by 9, we need to take x = 2. Then, 25 + 2 = 27, which is divisible by 9. Thus, the smallest value of x is 2.

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