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Question (21)

QN009259

Which of the following decimal numbers is rational?

(A) 0.121212…
(B) π
(C) √3
(D) 0.1010010001…

Correct Answer: A

Explanation:

Repeating decimals are rational.

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Question (22)

QN009260

Evaluate: (7/15) – (2/9)

(A) 11/45
(B) 5/24
(C) 9/45
(D) 13/45

Correct Answer: A

Explanation:

21/45 – 10/45 = 11/45

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Question (23)

QN009261

If a/b = c/d, then ad = bc. This property is called:

(A) Closure property
(B) Cross multiplication property
(C) Identity property
(D) Distributive property

Correct Answer: B

Explanation:

Equality of rational numbers follows cross multiplication.

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Question (24)

QN009262

Which rational number is the smallest?

(A) 2/3
(B) –5/6
(C) –1/2
(D) 1/4

Correct Answer: B

Explanation:

–5/6 is less than –1/2.

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Question (25)

QN009263

Evaluate: (–4/9) × (27/8)

(A) –3/2
(B) 3/2
(C) –12
(D) 12

Correct Answer: A

Explanation:

(–4 × 27)/(9 × 8) = –108/72 = –3/2

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Question (26)

QN009264

The set of rational numbers is closed under:

(A) Addition only
(B) Addition and subtraction only
(C) Addition, subtraction, and multiplication only
(D) Addition, subtraction, multiplication, and division except by zero

Correct Answer: D

Explanation:

Rational numbers remain rational under these operations except division by zero.

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Question (27)

QN009265

Find the value of: (2/5 + 3/10) × 4

(A) 14/5
(B) 7/5
(C) 28/10
(D) 2/5

Correct Answer: A

Explanation:

2/5 + 3/10 = 7/10 and 7/10 × 4 = 14/5

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Question (28)

QN009266

Which fraction is equivalent to 9/12?

(A) 2/3
(B) 3/4
(C) 4/9
(D) 12/9

Correct Answer: B

Explanation:

9/12 simplifies to 3/4.

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Question (29)

QN009267

A student walked 3/4 km in the morning and 5/6 km in the evening. Total distance walked is:

(A) 19/12 km
(B) 9/10 km
(C) 7/12 km
(D) 5/8 km

Correct Answer: A

Explanation:

9/12 + 10/12 = 19/12 km

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Question (30)

QN009268

Evaluate: 1 – 7/9

(A) 2/9
(B) 7/9
(C) 8/9
(D) 1/9

Correct Answer: A

Explanation:

9/9 – 7/9 = 2/9

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Question (21)

Which of the following decimal numbers is rational?

Explanation:

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Question (22)

Evaluate: (7/15) – (2/9)

Explanation:

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Question (23)

If a/b = c/d, then ad = bc. This property is called:

Explanation:

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Question (24)

Which rational number is the smallest?

Explanation:

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Question (25)

Evaluate: (–4/9) × (27/8)

Explanation:

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Question (26)

The set of rational numbers is closed under:

Explanation:

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Question (27)

Find the value of: (2/5 + 3/10) × 4

Explanation:

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Question (28)

Which fraction is equivalent to 9/12?

Explanation:

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Question (29)

A student walked 3/4 km in the morning and 5/6 km in the evening. Total distance walked is:

Explanation:

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Question (30)

Evaluate: 1 – 7/9

Explanation:

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