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Question (11)

QN0033437

Which statement is always true for a prime number?

(A) It is even.
(B) It has more than four factors.
(C) It has exactly two factors.
(D) It is divisible by 10.

Correct Answer: C

Explanation:

Prime numbers have only 1 and the number itself as factors.

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Question (12)

QN0033438

The common factors of 14 and 49 are

(A) 1 and 7
(B) 1 and 14
(C) 1, 2 and 7
(D) 7 and 14

Correct Answer: A

Explanation:

Both 14 and 49 are divisible by 1 and 7.

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Question (13)

QN0033439

Which number is the smallest common multiple of 4, 5 and 10?

(A) 10
(B) 20
(C) 30
(D) 40

Correct Answer: B

Explanation:

20 is divisible by 4, 5 and 10.

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Question (14)

QN0033440

A kangaroo jumps every 8 steps. Which of the following positions will it never reach?

(A) 24
(B) 40
(C) 56
(D) 62

Correct Answer: D

Explanation:

62 is not a multiple of 8.

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Question (15)

QN0033441

Which pair of numbers are co-prime?

(A) 16 and 24
(B) 18 and 27
(C) 11 and 12
(D) 20 and 30

Correct Answer: C

Explanation:

11 and 12 have only 1 as a common factor.

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Question (16)

QN0033442

If 45 is arranged in arrays, which factor pair is possible?

(A) 4 × 11
(B) 5 × 9
(C) 6 × 7
(D) 8 × 5

Correct Answer: B

Explanation:

5 × 9 = 45.

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Question (17)

QN0033443

Which number is a common factor of 30, 45 and 60?

(A) 4
(B) 5
(C) 7
(D) 8

Correct Answer: B

Explanation:

5 divides 30, 45 and 60 exactly.

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Question (18)

QN0033444

A deer reaches numbers 9, 18, 27, 36, ... . Which statement is correct?

(A) The deer jumps by 6 steps.
(B) The deer touches multiples of 9.
(C) The deer touches only even numbers.
(D) The deer touches prime numbers only.

Correct Answer: B

Explanation:

All the numbers listed are multiples of 9.

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Question (19)

QN0033445

Which of the following numbers has the largest number of factors?

(A) 17
(B) 18
(C) 19
(D) 23

Correct Answer: B

Explanation:

Factors of 18 are 1, 2, 3, 6, 9 and 18.

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Question (20)

QN0033446

Two animals start from 0. One jumps by 2 steps and the other by 5 steps. Which number will both touch for the third time (excluding 0)?

(A) 10
(B) 20
(C) 30
(D) 40

Correct Answer: C

Explanation:

Common multiples of 2 and 5 are 10, 20, 30, ... The third common multiple is 30.

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Question (11)

Which statement is always true for a prime number?

Explanation:

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Question (12)

The common factors of 14 and 49 are

Explanation:

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Question (13)

Which number is the smallest common multiple of 4, 5 and 10?

Explanation:

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Question (14)

A kangaroo jumps every 8 steps. Which of the following positions will it never reach?

Explanation:

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Question (15)

Which pair of numbers are co-prime?

Explanation:

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Question (16)

If 45 is arranged in arrays, which factor pair is possible?

Explanation:

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Question (17)

Which number is a common factor of 30, 45 and 60?

Explanation:

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Question (18)

A deer reaches numbers 9, 18, 27, 36, ... . Which statement is correct?

Explanation:

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Question (19)

Which of the following numbers has the largest number of factors?

Explanation:

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Question (20)

Two animals start from 0. One jumps by 2 steps and the other by 5 steps. Which number will both touch for the third time (excluding 0)?

Explanation:

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