# Number System Questions and Answers updated daily – Aptitude

Number System Questions: Solved 444 Number System Questions and answers section with explanation for various online exam preparation, various interviews, Aptitude Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

## Number System Questions

81. Find the least two digit number which will divide 42 and 7 without leaving any remainder ?

Correct Ans:42
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices is divisble by both the numbers. If any choice doesn't get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers.
So, 42 is a correct answer.

Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.
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82. Below Numbers follow a particular pattern. Can you find the next number ?

173, 192, 211, 230, _____

Correct Ans:249
Explanation:
The given series is -- 173, 192, 211, 230
Consequtive numbers increases by 19
Following this pattern, the Missing Number should increase by 19 from the previous number.
When we add 19 to the last number (i.e 230) we get 230+19=249
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83. In the given series, can you find the next number ?

173, 154, 135, 116, _____

Correct Ans:97
Explanation:
The given series is -- 173, 154, 135, 116
Consequtive numbers decreases by 19
Following this pattern, the Missing Number should decrease by 19 from the previous number.
When we subract 19 to the last number (i.e 116) we get 116-19= 97
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84. Find the HCF of 59 , 6?

Correct Ans:1
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices divides both the numbers. If any of the given choices doesnâ€™t divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.
Workspace

85. Two bells toll at an interval of 42 sec and 5 sec. After how many seconds, will both the bells ring together?

Correct Ans:210
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices is divisble by both the numbers. If any choice doesnt get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.
Workspace

86. Fifth number is missing in the below series. Can you find the fifth number in the below series ?

173, 190, 207, 224, _____

Correct Ans:241
Explanation:
The given series is -- 173, 190, 207, 224
Consequtive numbers increases by 17
Following this pattern, the Missing Number should increase by 17 from the previous number.
When we add 17 to the last number (i.e 224) we get 224+17=241
Workspace

87. Can you find the the next number in the below series

173, 158, 143, 128, _____

Correct Ans:113
Explanation:
The given series is -- 173, 158, 143, 128
Consequtive numbers decreases by 15
Following this pattern, the Missing Number should decrease by 15 from the previous number.
When we subract 15 to the last number (i.e 128) we get 128--15=113
Workspace

88. Find the HCF of 59 , 22?

Correct Ans:1
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices divides both the numbers. If any of the given choices doesnâ€™t divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.
Workspace

89. Find the LCM of 42 , 3?

Correct Ans:42
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices is divisble by both the numbers. If any choice doesnâ€™t get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.
Workspace

90. Fourth number is missing in the below series. Can you find the Fourth number in the below series ?

133, 156, 179, X , 225, 248

Correct Ans:202
Explanation:
The given series is -- 133, 156, 179, X , 225, 248
Consequtive numbers increases by 23
Following this pattern, the Missing Number X should increase by 23 from the previous number.
When we add 23 to the number before X (i.e 179) we get 179+23=202
Workspace

91. Find the HCF of 12 , 14?

Correct Ans:2
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices divides both the numbers. If any of the given choices doesnâ€™t divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.
Workspace

92. Find the LCM of 25 , 30?

Correct Ans:150
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices is divisble by both the numbers. If any choice doesnâ€™t get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.
Workspace

93. Can you find the the missing number in the below series

133, 106, 79, X , 25, -2

Correct Ans:52
Explanation:
The given series is -- 133, 106, 79, X , 25, -2
Consequtive numbers decreases by 27
Following this pattern, the Missing Number X should decrease by 27 from the previous number.
When we subract 27 to the number before X (i.e 79) we get 79--27=52
Workspace

94. Find the HCF of 12 , 120?

Correct Ans:12
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices divides both the numbers.
If any of the given choices doesn’t divide both the numbers, then you can eliminate that particular choice and move to the next choice.
Answer will be the HIGHEST Number that exactly divides both given numbers.

So 12 is HCF.
Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.
Workspace

95. Find the LCM of 25 , 20?

Correct Ans:100
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices is divisble by both the numbers. If any choice doesn’t get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.
Workspace

96. Find the Missing number in the the below series
133, 160, 187, X , 241, 268

Correct Ans:214
Explanation:
The given series is -- 133, 160, 187, X , 241, 268
Consequtive numbers increases by 27
Following this pattern, the Missing Number X should increase by 27 from the previous number.
When we add 27 to the number before X (i.e 187) we get 187+27=214
Workspace

97. Find the HCF of 12 , 10?

Correct Ans:2
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices divides both the numbers. If any of the given choices doesnâ€™t divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.
Workspace

98. Find the LCM of 25 , 24?

Correct Ans:600
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices is divisble by both the numbers. If any choice doesnâ€™t get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.
Workspace

99. Which number should come in place of the missing Number ?

117, 148, 179, X , 241, 272

Correct Ans:210
Explanation:
The given series is -- 117, 148, 179, X , 241, 272
Consequtive numbers increases by 31
Following this pattern, the Missing Number X should increase by 31 from the previous number.
When we add 31 to the number before X (i.e 179) we get 179+31=210
Workspace

100. Find the HCF of 12 , 8?

Correct Ans:4
Explanation:
The fastest way to find the correct answer is by elimination rule :
Check whether each of the given choices divides both the numbers. If any of the given choices doesnâ€™t divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers.
Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.
Workspace

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