CBSE Class 6 Mathematics Playing with Numbers MCQs

Question: Which is greatest 3-digit number exactly divisible by 8,10,12

a) 960

b) 980

c) 360

d) 120

Answer: 960

Question: Divisibility by 2,5,10 can be checked by

a) Last digit

b) Sum of digits

c) Last two digits

d) Last three digits

Answer: Last digit

Question: Find the least number which when divided by 6,15 and 18 leave remainder 5 in each case

a) 95

b) 180

c) 90

d) 185

Answer: 95

Question: L.C.M. of two co-prime numbers is always

a) Product of numbers

b) Sum of numbers

c) None

d) Difference of numbers

Answer: Product of numbers

Question: Find the L.C.M. of 12 and 18

a) 36

b) 6

c) 12

d) 18

Answer: 36

Question: 4= 2x2 , 15= 3x5, so H.C.F. of 4 and 15 is

a) 1

b) 0

c) 2

d) 3

Answer: 1

Question: What is the H.C.F. two consecutive odd numbers

a) 1

b) 2

c) 4

d) 8

Answer: 1

Question: What is the H.C.F. two consecutive even numbers

a) 2

b) 4

c) 8

d) 1

Answer: 2

Question: What is the H.C.F. of 18 and 48

a) 6

b) 8

c) 4

d) 2

Answer: 6

Question: The sum of two consecutive odd number is always divisible by

a) 4

b) 2

c) 6

d) 8

Answer: 4

Question: The product of three consecutive numbers is always divisible by

a) 6

b) 8

c) 4

d) 2

Answer: 6

Question: Which of the following numbers has 4 different prime factors

a) 210

b) 100

c) 120

d) 24

Answer: 210

Question: Which of the following expression has prime factors

a) 56=7x2x2x2

b) 70= 2x5x7

c) 54=2x3x9

d) 24=2x3x4

Answer: 56=7x2x2x2

Question: What are the prime factors of greatest 4 digit number

a) 3x3x11x101

b) 9x11x101

c) 3x33x101

d) 3 x3 x 11 x11

Answer: 3x3x11x101

Question: The product of L.C.M and H.C.F. of two numbers is equal to

a) Product of numbers

b) Sum of numbers

c) Difference of numbers

d) Quotients of numbers

Answer: Product of numbers

Question: If a number is divisible two co-prime numbers than it is divisible by their

a) Product also

b) Difference also

c) Sum also

d) Quotient also

Answer: Product also

Question: Common factors of 15 and 25 are

a) 5

b) 75

c) 25

d) 15

Answer: 5

Question: Which of the following pair is co-prime

a) 18 and 35

b) 6 and 8

c) 7 and 35

d) 30 and 415

Answer: 18 and 35

Question: Two numbers having only 1 as common factor are called

a) Co- prime numbers

b) Composite numbers

c) Odd numbers

d) Prime numbers

Answer: Co- prime numbers

Question:

The missing number is:

a) 2

b) 3

c) 4

d) 1

Answer: 2

Question: A number is divisible by 4 if its

a) Last two digits are divisible by 4

b) Last digit is 4

c) Last digit is 0

d) Last digit is 8

Answer: Last two digits are divisible by 4

Question: Which of the following number is divisible by 3

a) 123

b) 121

c) 124

d) 122

Answer: 123

Question: If a number is divisible by 2 and 3 both then is divisible by

a) 6

b) 8

c) 10

d) 5

Answer: 6

Question: The smallest composite number is

a) 4

b) 3

c) 2

d) 1

Answer: 4

Question: Tell the maximum consecutive numbers less then 100 so that there is no prime number between them

a) 7

b) 8

c) 6

d) 5

Answer: 7

Question: The sum of two odd and one even numbers is

a) Even

b) Odd

c) Prime

d) Composite

Answer: Even

Question: The only prime number which is also even

a) 2

b) 1

c) 4

d) 6

Answer: 2

Question: Which of the following is smallest prime number:

a) 2

b) 3

c) 4

d) 1

Answer: 2

Question: The multiple of 2 are also called

a) Even numbers

b) Odd numbers

c) Prime numbers

d) Composite numbers

Answer: Even numbers

Question: Which number is neither prime nor composite

a) 1

b) 2

c) 3

d) 0

Answer: 1

a) 1,2,3,6

b) 1,2,3

c) 2,3

d) 1,6

Answer: 1,2,3,6

Question: Which of the following is an odd composite number?

a) 9

b) 11

c) 12

d) 7

Answer: 9

Question: The number of even number between 68 and 90 is

a) 11

b) 2

c) 31

d) 10

Answer: 11

Question: Which of the following is a prime number?

a) 97

b) 91

c) 87

d) 69

Answer: 97

Question: Which of the following is a pair of twin- prime numbers?

a) 43,47

b) 59,61

c) 73,79

d) 19,21

Answer: 43,47

Question: The number of distinct prime factors of the largest 4-digit number is

a) 2

b) 3

c) 5

d) none of these

Answer: 2

Question: The number of distinct prime factors of the smallest 5 digit number is

a) 2

b) 4

c) 6

d) 8

Answer: 2

Question: The sum of the prime factors of 1729 is

a) 39

b) 32

c) 19

d) 13

Answer: 39

Question: Which of the following is a pair of co-prime numbers?

a) 8,45

b) 3,18

c) 5,35

d) 6,39

Answer: 8,45

Question: Every natural number has an infinite number of

a) multiples

b) none of these

c) factors

d) prime factors

Answer: multiples

Question: Which of the following number is divisible by 4?

a) 506784

b) 732106

c) 9301538

d) 308594

Answer: 506784

Question: Which of the following number is divisible by 8?

a) 703568

b) 305678

c) 505268

d) 503786

Answer: 703568

Question: Which of the following number is divisible by 3?

a) 42063

b) 52871

c) 37036

d) 50762

Answer: 42063

Question: Which of the following number is divisible by 9?

a) 972063

b) 730542

c) 785423

d) 5612844

Answer: 972063

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

a) 650374

b) 798653

c) 750972

d) 560324

Answer: 650374

Question: The digit by which * should be replaced in 54 * 281 so that the number formed is divisible by 9 is

a) 7

b) 8

c) 9

d) 6

Answer: 7

Question: The digit by which * should be replaced in 7254 * 98 so that the number formed is divisible by 22 is

a) 6

b) 2

c) 1

d) 0

Answer: 6

Question: If a number is divisible by 5 and 6 both, then it may not be divisible by

a) 30

b) 15

c) 10

d) 60

Answer: 30

Question: The number of common prime factors of 60, 75 and 105 is

a) 5

b) 4

c) 3

d) 2

Answer: 5

Question: The HCF of 144 and 198 is

a) 18

b) 12

c) 9

d) 6

Answer: 18

Question: The LCM of 30 and 45 is

a) 90

b) 45

c) 30

d) 15

Answer: 90

Question: The LCM of 4 and 44 is

a) 44

b) 176

c) 11

d) 4

Answer: 44

Question: The LCM of 7 and 13 is

a) 91

b) 13

c) 7

d) 1

Answer: 91

Question: If HCF of two numbers is 15 and their product is 1575, then their LCM is

a) 105

b) 525

c) 1575

d) 15

Answer: 105

Question: The numbers having more than two factors are called

a) Composite numbers

b) Prime numbers

c) Even numbers

d) Odd numbers

Answer: Composite numbers

Question: The numbers having two factors are called

a) Prime

b) Composite

c) Odd

d) Even

Answer: Prime

Question: Which of following number is multiple of 8

a) 16

b) 2

c) 4

d) 10

Answer: 16

Question: How many factors does 36 has

a) 9

b) 7

c) 10

d) 8

Answer: 9 

Question: A number for which sum of all its factors is equal to twice number is called

a) Perfect number

b) Prime number

c) Odd number

d) even number

Answer: Perfect number

Question: Every number is multiple of

a) Itself

b) 10

c) 2

d) 1

Answer: Itself

Question: The numbers of multiples of given number are

a) Infinite

b) Finite

c) 2

d) 1

Answer: Infinite

Question: Numbers of factors of given number are:

a) Finite

b) Infinite

c) 1

d) 2

Answer: Finite

Question: Which number is factor of every number

a) 1

b) 2

c) 10

d) 100

Answer: 1

Question: The exact divisor of number 9 is

a) 3

b) 4

c) 5

d) 2

Answer: 3

Question. Which of the following is the factor of every number ?

(a)-- 1

(b) zero

(c) 1

(d) any number 

Question. How many factors does 36 have ?

(a) 5

(b) 6

(c) 7

(d) 9 

Question. Which of the following is the smallest prime number ?

(a) 1

(b) 2

(c) 3

(d) 5 

Question. How many prime numbers are there between 1 & 20 ?

(a) 7

(b) 8

(c) 9

(d) 10

Question. Which of the following is the smallest composite number ?

(a) 2

(b) 3

(c) 4

(d) 5

Question. Which of the following is the HCF of the numbers 20,28 &36 ?

(a) 20

(b) 36

(c) 4

(d) 5

Question. Which of the following is the LCM of the numbers 20,30 &60 ?

(a) 20

(b) 30

(c) 60

(d) 36000