# 3rd Class Mental Ability Inserting Missing Number

Inserting Missing Number

Category : 3rd Class

Inserting Missing Number

Learning Objectives

• To get aware of Missing Number.
• Improving the general awareness.
• Increasing the word power.

Introduction

In these types of questions different characters/numbers/letters are arranged in a matrix with one term missing or characters are arranged in a wide range of geometrical figures. The characters in such arrangement follow a certain pattern and you are required to identify that pattern so that you can substitute the question mark (?) with a suitable character.

Let us see some examples to understand this concept properly.

Example-1

1.         Find the number which replaces the question mark (?). (a) 39                            (b) 42

(c) 45                           (d) 55

(e) None of these

Explanation: The number obtained by adding the numbers is written inside the figures.

13 + 12 + 9 + 1 = 35.

15 + 13 + 8 + 5 = 41.

16 + 17 + 9 + 3 = 45.

Rest of the options is incorrect because of the correctness of option (c).

2.            Find the missing number in the given number pattern below. (a) 25                                        (b) 21

(c) 19                                        (d) 14

(e) None of these

Explanation: In this pattern, the middle term is the sum of difference between the Left and Right, top and bottom numbers.

(12 - 3) + (10 - 5) = 9 + 5 = 14

(15 - 5) + (17 - 8) = 10 + 9 = 19

Similarly, in the third pattern the missing number is (17 - 9) + (15 - 9) = 8 + 6 = 14

Rest of the options is incorrect because of the correctness of option (d).

3.            Find the missing number in the given number pattern below. (a) 76                                        (b) 88

(c) 100                                      (d) 120

(e) None of these

Explanation: Centre number is double the sum of numbers given in outside circles.

1 + 6 + 3 + 4 + 5 + 14 + 7 + 9 = 49 and Similarly: 2 + 5 + 4 + 7 + 3 + 9 + 8 + 12 = 50 and Rest of the options is incorrect because of the correctness of option (c).

4.            Find the missing number in the given number pattern below.

 4 8 12 1 5 9 3 7 ?

(a) 9                                          (b) 10

(c) 11                                        (d) 15

(e) None of these

Explanation: Rule followed in the question Similarly Rest of the options is incorrect because of the correctness of option (c).

5.            In the given figure, numbers have been arranged in a certain pattern. Which number will replace the question mark (?). (a) 1                             (b) 2

(c) 18                                        (d) 24

(e) None of these

Explanation: The numbers that are diagonally situated are show in the pattern as follows:    Rest of the options is incorrect because of the correctness of option (d).

1.          Find the missing number in the given number pattern. (a) 15                            (b) 20

(b) 10                            (d) 8

(e) None of these

Explanation: (13 + 8) - 9 = 21 - 9 = 12

(6 + 4) - 3 = 10 – 3 = 7

(11 + 5) - 8 = 16 – 8 = 8

Rest of the options is incorrect because of the correctness of option (d).

2.            Find the missing number in the given number pattern. (a) 16                            (b) 10

(c) 8                             (d) 6

(e) None of these

Explanation: In this pattern follows as: Rest of the options is incorrect because of the correctness of option (d).

3.            Find the missing number in the given number pattern. (a) 38                            (b) 45

(b) 58                            (d) 63

(e) None of these

Explanation:     Rest of the options is incorrect because of the correctness of option (d).

4.            Find the missing number in the given number pattern. (a) 6                                          (b) 8

(c) 10                            (d) 15

(e) None of these

Explanation: Sum of numbers in each square chain is 31.

15 + 7 + 9 = 31.

7 + 8 + 16 = 31.

12 + 11 + 8 = 31.

Rest of the options is incorrect because of the correctness of option (b).

5.            Find the missing number. (a) 95                            (b) 52

(c) 48                                        (d) 38

(e) None of these Explanation: There are three parts in the figure namely I, II and III.

Number in part III is obtained by the multiplication of number in part I and part II. Rest of the options is incorrect because of the correctness of option (c).

6.            Which number will replace the question mark? (a) 8                             (b) 9

(c) 10                            (d) 12

(e) None of these

Explanation: . .

Similarly .

Rest of the options is incorrect because of the correctness of option (d).

7.            Find the missing number. (a) 8                              (b) 6

(c) 5                                          (d) 4

(e) None of these

Explanation:  Similarly, 27 - 2x = 19

2x = 8 Rest of the options is incorrect because of the correctness of option (d).

8.          Find the missing number in the given number series. (a) 25                                        (b) 26

(c) 28                                        (d) 30

(e) None of these

Explanation: Rest of the options is incorrect because of the correctness of option (d).

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