Mathematical Operations Reasoning Examples, Tips and Tricks - 1

Question: 1

In each of the following questions, if the given interchanges are made in signs and numbers, which one of the four equations would be correct?
Given interchanges : Signs - and × and numbers 3 and 6

(A) 6 - 3 × 2 = 9

(B) 3 - 6 × 8 = 10

(D) 3 × 6 - 4 = 33

View Answer

Ans: B

On interchanging - and × and 3 and 6 in (b), we get the equation as :

6 × 3 - 8 = 10 or 18 - 8 = 10 or 10 = 10, which is true.

Question: 2

In each of the following questions, if the given interchanges are made in signs and numbers, which one of the four equations would be correct?
Given interchanges : Signs - and ÷ and numbers 4 and 8

(A) 6 - 8 ÷ 4 = - 1

(B) 8 - 6 ÷ 4 = 1

(D) 4 - 8 ÷ 6 = 2

View Answer

Ans: C

On interchanging - and ÷ and 4 and 8 in (c), we get the equation as :

8 - 4 ÷ 2 = 6 or 8 - 2 = 6 or 6 = 6, which is true.

Question: 3

In each of the following questions, if the given interchanges are made in signs and numbers, which one of the four equations would be correct?
Given interchanges : Signs + and × and numbers 4 and 5

(A) 5 × 4 + 20 = 40

(B) 5 × 4 + 20 = 85

(D) 5 × 4 + 20 = 95

View Answer

Ans: C

On interchanging + and × and 4 and 5 in (c), we get the equation as :

4 + 5 × 20 = 104 or 104 = 104, which is true.

Question: 4

In each of the following questions, if the given interchanges are made in signs and numbers, which one of the four equations would be correct? Given interchanges : Signs + and - and numbers 4 and 8

(A) 4 ÷ 8 - 12 = 16

(B) 4 - 8 + 12 = 0

(D) 8 - 4 ÷ 12= 8

View Answer

Ans: B

On interchanging + and -and 4 and 8 in (b), we get the equation as :

8 + 4 - 12 = 0 or 12 - 12 = 0 or 0 = 0, which is true.

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Mathematical Operations Reasoning Examples, Tips and Tricks - 1

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