# 8th Class Mental Ability Inserting Missing Number

Inserting Missing Number

Category : 8th Class

Inserting Missing Number

Learning Objectives

• Inserting the Missing Numbers

Inserting the Missing Numbers

In such type of questions, a figure, a set of figures or a matrix is given, each of which bears certain characters, and be it numbers, letters or a group of letters / numbers following a certain pattern. The candidate is required to decipher this pattern and accordingly find the missing character in the figure.

Example 1 (a) 5                                          (b) 6

(c) 8                                          (d) 9

(e) None of these

Explanation: The sum of numbers on right and centre subtracted from the number on the left gives the number at the bottom, i.e.

$93-\left( 27+63 \right)=3;\text{ }79-\left( 38+37 \right)=4,$

Similarly, $67-\left( 16+42 \right)=9$

• Example 2 (a) 3                             (b) 8

(c) 10                                        (d) 14

(e) None of these

Explanation: Letter R is 18th in order of alphabetical series. So the product of vertically opposite numbers + 18 (R) = the sum of two horizontally opposite number, i.e.,

$(28\times ~23)+18=173+489$

$644+18=662$

$662=662$

Letter C is 3rd in order, so

$(54~\times 15)+3=342+471$

$810+3=813$

$813=813$

Similarly, letter D is 4th in order

$(1\times ~11)+4=5+?$

$11+4=5+?$

$15=5+?$ or  $5+?=15$

So'           $?=15-5=10$ (a) 31                            (b) 229

(c) 234                          (d) 312

(e) None of these

Explanation: The number at the bottom is the product of two numbers at the top, i.e.,

$13~\times 17=221$

$12\times ~19=228,$

Similarly, $13~\times 18=234$ (a) 693                                      (b) 939

(c) 981                                      (d) 993

(e) None of these

Explanation: The squares of two numbers on the top placed side by side gives the number inside the bottom triangle, i.e.,

${{6}^{2}}$ and ${{3}^{2}}=369$

${{2}^{2}}$ and ${{5}^{2}}=425,$

Similarly, ${{3}^{2}}$ and ${{9}^{2}}=981.$

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