MCQ Questions

Question No. 1

Fill in the blanks:

Answer :

(a) A number can have __________ multiples.

(b) A number which has 2 as one of its factor is called an _______ number.

(c) A number which does not have 2 as one of the factors is an ________ number.

(c) A prime number has only _________ factors.

Question No. 2

True or False:

Answer :

(a) 1 is a factor of every number and every number is a factor of itself.

(b) The numbers having 0, 2, 4, 6 or 8 in the ones place are always divisible by 2.

(c) A number is divisible by 3 if sum of its digits is divisible by 3.

(d) The process of finding all the prime factors of a number Is called prime factorization.

Question No. 3

One word answer:

Answer :

(a) What are the prime factors of 812.

(b) What are the prime factors of 3240.

(c) What are the prime factors of 1725.

(d) What are the prime factors of 54.

Question No. 4

Separate the prime numbers and composite numbers from the numbers given below:

Answer :

6, 28, 39, 13, 63 and 47.

Question No. 5

Fill in the blanks so that the numbers are divisible by ‘11’:

Answer :

(a) 4_6_1

(b) _8_3

(c) 1_4_5

(d) 1_0_1

Question No. 6

Say ‘true’ or ‘false’ :

Answer :

(a) Prime number can have either 1 or 2 factor.

(b) 2 and 3 is the only pair of successive prime number between 1 and 100.

(c) There are 26 prime numbers between 1 and 100.

(d) There are 74 composite numbers between 1 and 100.

(e) All composite numbers are divisible by 2.

Question No. 7

Which of the following numbers are divisible by 2 ?

Answer :

(a) 3890 (b) 9786 (c) 278

(d) 7376 (e) 1208 (f) 4856257

Question No. 8

Which of the following numbers are divisible by 3 ?

Answer :

(a) 771 (b) 179 (c) 835

(d) 99999 (e) 66186627 (f) 45376

Question No. 9

Test the divisibility of following numbers by 4 ?

Answer :

(a) 1132 (b) 7718 (c) 8816

(d) 1260 (e) 4408806 (f) 7520936

Question No. 10

Which of the following numbers are divisible by 5 ?

Answer :

(a) 18540 (b) 356795 (c) 6165530

(d) 22400724 (e) 2618850 (f) 21743962

Question No. 11

Test whether the following numbers are divisible by any one or two or all of 7, 8, and 9.

Answer :

(a) 854 (b) 5679 (c) 14456

(d) 64340 (e) 159786 (f) 26165530

Question No. 12

Find all the prime factors for the following numbers :

Question No. 13

Questions -

Answer :

1. Find the prime factors of 12 and 16 and write the prime factors which are common to both.

2. Find the prime factors of 100, 250 and 1600 and write the prime factors which are common.

Question No. 14

Find the HCF by horizontal method :

Answer :

(a) 92,138

(b) 320,440

(c)440,385

(d) 36,45

Question No. 15

Find HCF by vertical method :

Answer :

(a) 28,36

(b) 230,322

(c) 504,672

(d) 693,2079

Question No. 16

Find HCF by long division method :

Answer :

(a) 385,440,495

(b) 216,468, 828

(c) 15,36,40

(d) 16, 18,20

Question No. 17

Find LCM by prime factorization method :

Answer :

(a) 180,200, 240

(b) 15, 20, 25, 30

(c) 18, 24, 72

(d) 15,20,35

Question No. 18

Find LCM by using division method :

Answer :

(a) 96,256, 288

(b) 40,480,560

(c) 140, 210,350

(d) 18, 24,32

Question No. 19

Solve -

Answer :

1. Find the greatest number which divides 105 and 180 without leaving any remainder.

2. Find the greatest number which divides 157, 178 and 218 leaving remainder 5, 7 and 9 respectively.

3. Find the least number which divides 20,25 and 50 leaving a remainder of 9.

4. The product of two numbers is 288 and their HCF is 4. Find LCM.

Question No. 20

A number can have ____________ multiples.

Answer :

two

three

infinite

Question No. 21

A prime number has only _______ factors.

Answer :

two

three

none of these

Question No. 22

13 is a ______ number.

Answer :

even

prime

none of these

Question No. 23

A composite number has __________ factors.

Answer :

two

more than two

none of these

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