LCM and HCF (MTSE)

Question 1 Multiple Choice (Single Answer)

Which is the greatest prime number less than 100?

98
97
91
87
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Question 2 Multiple Choice (Single Answer)

Numbers which have more than two factors are called

natural numbers
composite numbers
whole numbers
prime numbers
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Question 3 Multiple Choice (Single Answer)

Which of the following numbers is divisible by 3?

5761
4933
2862
1003
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Question 4 Multiple Choice (Single Answer)

Which of the following are co-prime numbers?

14, 15
10, 12
8, 12
9, 12
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Question 5 Multiple Choice (Single Answer)

By what smallest number must * in 23*54 be replaced to make it divisible by 9?

6
4
3
1
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Question 6 Multiple Choice (Single Answer)

Which of the following statements is/are true?

If a number is divisible by 3, it must be divisible by 9.
If a number is divisible by 2, it must be divisible by 4.
If a number is divisible by 2 and 3, it must be divisible by 6.
If a number is divisible by 4, it must be divisible by 8.
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Question 7 Multiple Choice (Single Answer)

Which of the following are prime triplets?

1, 3, 5
7, 11, 13
11, 13, 17
3, 5, 7
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Question 8 Multiple Choice (Single Answer)

The HCF of two co-prime numbers is

3
0
1
2
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Question 9 Multiple Choice (Single Answer)

The HCF and LCM of two numbers are 7 and 42, respectively. If one of the numbers is 21, find the other number.

14
28
7
49
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Question 10 Multiple Choice (Single Answer)

Determine the longest tape which can be used to exactly measure the lengths 60 cm, 84 cm and 108 cm.

36 cm
42 cm
6 cm
12 cm
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Question 11 Multiple Choice (Single Answer)

The number divisible by 3 is

27326
42356
73545
45526
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Question 12 Multiple Choice (Single Answer)

Which of the following will be the LCM of co-prime numbers a and b?

a + b
a/b
ab
1
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Question 13 Multiple Choice (Single Answer)

Which of the following is the HCF of 170 and 238?

1190
2
1
34
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Question 14 Multiple Choice (Single Answer)

Four bells toll at intervals of 4, 7, 12 and 84 seconds. The bells toll together at 5 O'clock. When will they toll again together?

One minute 24 seconds past 5 O'clock
48 seconds past 5 O'clock
Three minute 20 seconds past 5 O'clock
28 seconds past 5 O'clock
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Question 15 Multiple Choice (Single Answer)

Which of the following is the HCF of two consecutive even numbers?

4
3
2
1
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Question 16 Multiple Choice (Single Answer)

How many prime numbers are between 70 and 90?

4
5
6
3
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Question 17 Multiple Choice (Single Answer)

Which of the following is a prime number?

291
277
323
361
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Question 18 Multiple Choice (Single Answer)

Which of the following numbers is divisible by 4, but not by 8?

96
128
136
148
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Question 19 Multiple Choice (Single Answer)

Which of the following are not co-primes?

83 and 38
78 and 117
99 and 19
47 and 74
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Questions

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