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Question (11)

QN009249

The additive identity for rational numbers is:

(A) 1
(B) –1
(C) 0
(D) 1/2

Correct Answer: C

Explanation:

Adding zero leaves the rational number unchanged.

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Question (12)

QN009250

Evaluate: (–2/3) + (5/6)

(A) 1/6
(B) –1/6
(C) 7/6
(D) –7/6

Correct Answer: A

Explanation:

–4/6 + 5/6 = 1/6

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Question (13)

QN009251

Which property is illustrated by 2/7 + 5/7 = 5/7 + 2/7?

(A) Associative property
(B) Closure property
(C) Commutative property
(D) Identity property

Correct Answer: C

Explanation:

Changing the order does not change the sum.

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Question (14)

QN009252

Evaluate: (3/4) × (8/9)

(A) 2/3
(B) 24/36
(C) 11/13
(D) 3/2

Correct Answer: A

Explanation:

(3 × 8)/(4 × 9) = 24/36 = 2/3

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Question (15)

QN009253

Which rational number is greater?

(A) –3/5
(B) –4/5
(C) Both are equal
(D) Cannot be compared

Correct Answer: A

Explanation:

Among negative numbers, the one closer to zero is greater.

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Question (16)

QN009254

The multiplicative inverse of 7/9 is:

(A) –7/9
(B) 9/7
(C) 7
(D) 1/7

Correct Answer: B

Explanation:

Reciprocal of a/b is b/a.

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Question (17)

QN009255

Evaluate: (–5/6) ÷ (5/12)

(A) –2
(B) 2
(C) –1/2
(D) 1/2

Correct Answer: A

Explanation:

(–5/6) × (12/5) = –2

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Question (18)

QN009256

Which of the following is NOT a rational number?

(A) 0.75
(B) 2/11
(C) √7
(D) –9

Correct Answer: C

Explanation:

√7 is irrational.

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Question (19)

QN009257

Find the sum: 5/12 + 7/18

(A) 29/36
(B) 12/30
(C) 1
(D) 17/18

Correct Answer: A

Explanation:

15/36 + 14/36 = 29/36

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Question (20)

QN009258

A rational number between –2 and –1 is:

(A) –3
(B) –5/2
(C) –3/2
(D) 0

Correct Answer: C

Explanation:

–3/2 lies between –2 and –1.

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