# 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

101. Find the LCM of 25 , 7?

Correct Ans:175
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.
The Lcm is 175.

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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102. What should come in place of X in the below number series?

117, 88, 59, X , 1, -28

Correct Ans:30
Explanation:
The given series is 117, 88, 59, X , 1, -28
Consequtive numbers decreases by 29
Following this pattern, the Missing Number X should decrease by 29 from the previous number.
When we subract 29 to the number before X (i.e 59) we get 59 - 29 = 30
Workspace

103. Find the HCF of 12 , 6?

Correct Ans:6
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.

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

104. Find the LCM of 25 , 5?

Correct Ans:25
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

105. Output of a particular program follows the below pattern. Can you find the Missing number?

117, 146, 175, X , 233, 262

Correct Ans:204
Explanation:
The given series is -- 117, 146, 175, X , 233, 262

Consequtive numbers increases by 29

Following this pattern, the Missing Number X should increase by 29 from the previous number.

When we add 29 to the number before X (i.e 175) we get 175+29=204
Workspace

106. Find the HCF of 12 , 22?

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

107. Find the LCM of 25 , 3?

Correct Ans:75
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

108. In the below given sequence, what should be the Missing number ?

117, 92, 67, X , 17, -8

Correct Ans:42
Explanation:
The given series is -- 117, 92, 67, X , 17, -8
Consequtive numbers decreases by 25
Following this pattern, the Missing Number X should decrease by 25 from the previous number.
When we subract 25 to the number before X (i.e 67) we get 67--25=42
Workspace

109. Find the HCF of 19 , 14?

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

110. Find the LCM of 41 , 30?

Correct Ans:1230
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

111. A Computer program gave the following output. Can you predict the Missing number in the computer output ?

117, 142, 167, X , 217, 242

Correct Ans:192
Explanation:
The given series is -- 117, 142, 167, X , 217, 242
Consequtive numbers increases by 25
Following this pattern, the Missing Number X should increase by 25 from the previous number.
When we add 25 to the number before X (i.e 167) we get 167+25=192
Workspace

112. Find the HCF of 19 , 12?

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

113. Find the LCM of 41 , 20?

Correct Ans:820
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

114. A professor wrote down the below series in a class room. He wants his students to find the Missing number. Can you solve it ?

117, 96, 75, X , 33, 12

Correct Ans:54
Explanation:
The given series is -- 117, 96, 75, X , 33, 12
Consequtive numbers decreases by 21
Following this pattern, the Missing Number X should decrease by 21 from the previous number.
When we subract 21 to the number before X (i.e 75) we get 75--21=54
Workspace

115. Find the HCF of 19 , 10?

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

116. Find the LCM of 41 , 24?

Correct Ans:984
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

117. Below Numbers follow a particular pattern. Can you find the Missing number in the below pattern?

117, 138, 159, X , 201, 222

Correct Ans:180
Explanation:
The given series is -- 117, 138, 159, X , 201, 222
Consequtive numbers increases by 21
Following this pattern, the Missing Number X should increase by 21 from the previous number.
When we add 21 to the number before X (i.e 159) we get 159+21=180
Workspace

118. Find the HCF of 19 , 8?

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

119. In the given series, can you find the Missing number ?

117, 94, 71, X , 25, 2

Correct Ans:48
Explanation:
The given series is -- 117, 94, 71, X , 25, 2
Consequtive numbers decreases by 23
Following this pattern, the Missing Number X should decrease by 23 from the previous number.
When we subract 23 to the number before X (i.e 71) we get 71--23=48
Workspace

120. Find the LCM of 41 , 5?

Correct Ans:205
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

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