Number Theory MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Number Theory, a fundamental topic in the field of Aptitude. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Number Theory MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Number Theory mcq questions that explore various aspects of Number Theory problems. Each MCQ is crafted to challenge your understanding of Number Theory principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Aptitude tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Number Theory MCQs are your pathway to success in mastering this essential Aptitude topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Number Theory. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Number Theory knowledge to the test? Let's get started with our carefully curated MCQs!

Number Theory MCQs | Page 15 of 17

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Q141.
Find the odd man out:
41, 43, 47, 53, 61, 71, 73, 81

a.

61

b.

71

c.

73

d.

81

Discuss
Answer: (d).81
Q142.
Find the odd man out:
3, 5, 7, 12, 17, 19

a.

19

b.

17

c.

5

d.

12

Discuss
Answer: (d).12
Q143.
If one-third of one-fourth of a number is 15, then three-tenth of that number is:

a.

35

b.

36

c.

45

d.

54

Discuss
Answer: (d).54
Q144.
Three times the first of three consecutive odd integers is 3 more than twice the third. The third integer is:

a.

9

b.

11

c.

13

d.

15

Discuss
Answer: (d).15
Q145.
The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?

a.

3

b.

4

c.

9

d.

Cannot be determined

Discuss
Answer: (b).4
Q146.
The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?

a.

4

b.

8

c.

16

d.

None of these

Discuss
Answer: (b).8
Q147.
A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:

a.

18

b.

24

c.

42

d.

81

Discuss
Answer: (b).24
Q148.
The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?

a.

69

b.

78

c.

96

d.

Cannot be determined

Discuss
Answer: (d).Cannot be determined
Q149.
The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:

a.

20

b.

30

c.

40

d.

None of these

Discuss
Answer: (a).20
Q150.
A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by:

a.

3

b.

5

c.

9

d.

11

Discuss
Answer: (d).11
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