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Question (1)

QN0020132

In a ‘Think of a Number’ trick, the starting number is usually represented by:

(A) 0
(B) 1
(C) x
(D) 10

Correct Answer: C

Explanation:

x is used as a variable to represent the unknown starting number.

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Question (2)

QN0020133

In the trick discussed, the first operation performed after thinking of a number is:

(A) Add 4
(B) Double it
(C) Divide by 2
(D) Subtract the original number

Correct Answer: B

Explanation:

The number is doubled first.

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Question (3)

QN0020134

After doubling a number x, the resulting algebraic expression is:

(A) x + 2
(B) x²
(C) 2x
(D) x/2

Correct Answer: C

Explanation:

Doubling x gives 2x.

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Question (4)

QN0020135

In the trick, after doubling x and adding 4, the expression becomes:

(A) x + 4
(B) 2x + 4
(C) 2x − 4
(D) x + 2

Correct Answer: B

Explanation:

Adding 4 to 2x gives 2x + 4.

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Question (5)

QN0020136

After dividing (2x + 4) by 2, the expression simplifies to:

(A) x + 4
(B) x + 2
(C) 2x + 2
(D) x − 2

Correct Answer: B

Explanation:

(2x + 4)/2 = x + 2.

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Question (6)

QN0020137

In the standard trick, the final result after subtracting the original number is always:

(A) 0
(B) 1
(C) 2
(D) Depends on x

Correct Answer: C

Explanation:

x + 2 − x = 2.

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Question (7)

QN0020138

If the chosen number is 8, the final result of the trick is:

(A) 8
(B) 4
(C) 2
(D) 0

Correct Answer: C

Explanation:

The trick always gives 2.

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Question (8)

QN0020139

If the chosen number is 25, the final result obtained is:

(A) 25
(B) 2
(C) 5
(D) 0

Correct Answer: B

Explanation:

The result is independent of the chosen number.

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Question (9)

QN0020140

If the chosen number is −3, the final result is:

(A) −3
(B) −2
(C) 0
(D) 2

Correct Answer: D

Explanation:

The trick works for negative numbers as well.

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Question (10)

QN0020141

The reason the trick works for every starting number is that:

(A) The number is doubled
(B) The original number cancels out
(C) 4 is added
(D) The result is guessed

Correct Answer: B

Explanation:

The variable x cancels in the final step.

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Question (1)

In a ‘Think of a Number’ trick, the starting number is usually represented by:

Explanation:

Link:

Question (2)

In the trick discussed, the first operation performed after thinking of a number is:

Explanation:

Link:

Question (3)

After doubling a number x, the resulting algebraic expression is:

Explanation:

Link:

Question (4)

In the trick, after doubling x and adding 4, the expression becomes:

Explanation:

Link:

Question (5)

After dividing (2x + 4) by 2, the expression simplifies to:

Explanation:

Link:

Question (6)

In the standard trick, the final result after subtracting the original number is always:

Explanation:

Link:

Question (7)

If the chosen number is 8, the final result of the trick is:

Explanation:

Link:

Question (8)

If the chosen number is 25, the final result obtained is:

Explanation:

Link:

Question (9)

If the chosen number is −3, the final result is:

Explanation:

Link:

Question (10)

The reason the trick works for every starting number is that:

Explanation:

Link:

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