Which of the following is NOT a function of the Prime Minister in India?
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Correct answer: (B) Appointment of Supreme Court judges
RRB JE · Mathematics
Number System Previous Year Questions
52 Number System (Mathematics) questions asked in RRB JE previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
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Other Mathematics topics
If 1 is added to each odd digit and 2 is subtracted from each even digit in the number 1534876, what will be the sum of the digits which are third from the left and third from the right?
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Correct answer: (C) 10
Below are given two sets of numbers. In each set of numbers, a certain mathematical operation on first number results in the second number. Similarly, certain mathematical operation on second number results in the third number and so on. Which of the given options follows the same set of operations as in question?
(NOTE – A two/three digit number cannot be broken into individual digits for operations e.g. if 37 is followed by 10, the operation cannot be 3+7 as a two digit number cannot be broken into individual digits)
2 – 14 – 44 – 88 ; 5 – 35 – 65 – 130
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Correct answer: (A) 7 – 49 – 79 – 158
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number results in the second number. Similarly, certain mathematical operation(s) on the second number results in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
4 - 8 - 16 - 32; 1 - 2 - 4 - 8
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Correct answer: (B) 5 - 10 - 20 - 40
When 268 is added to 6K8, the result is 9P6. What is the least possible value of K and P for which 9P6 is divisible by 3?
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Correct answer: (D) K=3; P=0
What are the units of inheritance, which Mendel referred to as 'factors,' now called?
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Correct answer: (D) Genes
If 1 is added to each odd digit and 2 is subtracted from each even digit in the number 7381564, how many digits will appear more than once in the new number thus formed?
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Correct answer: (A) Three
Which two numbers should be interchanged to make the following equation correct? 58 + (36× 4)÷ 3 + 6× 8 −12 = 86
(Note: Interchange should be done of the entire number and not individual digits of a given number.)
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Correct answer: (B) 36 and 12
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting /multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
19-57-114-134; 21-63-126-146
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Correct answer: (D) 16-48-96-116
With which of the following pricing approaches is a product's price equal to its marginal cost?
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Correct answer: (C) Marginal cost pricing
If 1 is added to each odd digit and 1 is subtracted from each even digit in the number 8436152, then what will be the difference between the last and the first digits from the left in the number thus formed?
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Correct answer: (C) 6
What is the smallest 4-digit number which, when divided by 12, 16, and 20, gives a remainder of 9?
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Correct answer: (A) 1209
This question is based on the five, three-digit numbers given below.
(Left) 473 987 324 529 648 (Right)
(Example: 697 – First digit = 6, second digit = 9 and third digit = 7)
NOTE: All the operations to be performed from left to right.
The position of how many numbers will remain unchanged if all these numbers are arranged in ascending order?
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Correct answer: (A) None
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting /multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
6-18-72-102; 8-20-80-110
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Correct answer: (C) 7-19-76-106
The LCM of two numbers is seven times of their HCF. If the product of two numbers is 448, then find the difference between LCM and HCF.
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Correct answer: (A) 48
A six-digit number is divisible by 91. If 143 is added to this number, the resulting number is divisible by which of the following number?
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Correct answer: (A) 13
What is the sum of the numbers between 250 and 450, such that when it is divided by 8, 12 and 18, it leaves no remainder?
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Correct answer: (A) 1080
This question is based on the five, four-digit numbers given below.
(Left) 5479 3126 6785 9254 1630 (Right)
(Example: 697 – First digit = 6, second digit = 9 and third digit = 7)
NOTE: All the operations to be performed from left to right.
What will be the resultant if the fourth digit of the second-greatest number is added to the third digit of the smallest number?
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Correct answer: (C) 8
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting /multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
12-60-120-130; 14-70-140-150
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Correct answer: (C) 16-80-160-170
Find the HCF of 84, 126 and 210.
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Correct answer: (A) 42
If 2 is added to each odd digit and 1 is subtracted from each even digit in the number 2687531, then how many digits will appear more than once in the new number thus formed?
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Correct answer: (D) Two
This question is based on five, four-digit numbers given below.
(Example- 6970 – First digit = 6, second digit = 9, third digit = 7 and fourth digit=0) 2314 7651 3245 9072 8062
How many numbers are there wherein the sum of first and second digits is equal to the sum of third and fourth digits?
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Correct answer: (A) Three
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting /multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
8-24-72-216; 6-18-54-162
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Correct answer: (B) 7-21-63-189
If 1 is added to each odd digit and 2 is subtracted from each even digit in the number 4835176, what will be the sum of the digits which are second from the left and second from the right?
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Correct answer: (D) 14
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting /multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
6-36-46-92; 7-49-59-118
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Correct answer: (A) 5-25-35-70
Who among the following is the leader of the house in the Lok Sabha?
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Correct answer: (D) Prime Minister
Find the value of K²− 3K, for which the number 58K764 is divisible by 11.
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Correct answer: (A) 40
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
16 – 17 – 21 – 30; 13 – 14 – 18 – 27
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Correct answer: (D) 22 – 23 – 27 – 36
Two pieces of cloth measure 96 metres and 144 metres in length. What is the maximum length of cloth that can be cut equally from both pieces without any remainder?
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Correct answer: (D) 48 metres
The sum of the squares of two consecutive even natural numbers is 3700. The sum of
the numbers is:
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Correct answer: (C) 86
This question is based on the five, three-digit numbers given below.
(Left) 453 914 527 658 715 (Right)
(Example- 697 – First digit = 6, second digit = 9 and third digit = 7)
NOTE - All operations to be done from left to right.
What will be the resultant if the third digit of the highest number is multiplied with the
second digit of the lowest number?
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Correct answer: (D) 20
M, A, T, H and S, each have different ages and all ages are integers. M is younger than
only two persons. H is 88 years old, which is the second highest age. S is younger than
M but older than A. Who is the eldest?
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Correct answer: (B) T
Which of the following is a biotic factor causing storage losses in grains?
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Correct answer: (D) Insects
Which of the following numbers is divisible by both 9 and 43?
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Correct answer: (B) 8901
Find the LCM of 8, 12, and 20.
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Correct answer: (C) 120
The 7-digit number 57A001B is divisible by 9. What is the minimum value of (A + B)?
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Correct answer: (A) 5
This question is based on the five, three-digit numbers given below.
(Left) 857 329 417 628 751 (Right)
(Example- 697 – First digit = 6, second digit = 9 and third digit = 7)
What will be the resultant if third digit of the highest number is added to the third digit
of lowest number?
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Correct answer: (C) 16
Refer to the following number and symbol series and answer the question that follows.
Counting to be done from left to right only. (Note: All numbers are single digit numbers
only.)
(Left) 8 9 & 8 $ 5 # @ & # 4 @ 3 ! + ? 4 5 & 8 (Right)
If all the symbols are dropped from the series, which of the following will be seventh
from the right?
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Correct answer: (A) 8
The 7-digit number 93A562B is divisible by 9, What is the minimum value of (A + B)?
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Correct answer: (A) 2
Find the least number which when divided by 5, 6, 3 and 4 leaves a remainder 2, but
when divided by 7 leaves no remainder.
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Correct answer: (D) 182
The product of two consecutive natural numbers is 506. The greater of the two numbers
is:
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Correct answer: (B) 23
The LCM of 5³ × 8² × 12, 5² × 12² × 16 and 8³ × 12² × 16² is:
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Correct answer: (A) 221 × 32 × 53
The sum of the squares of two consecutive odd natural numbers is 3530. The sum of
the numbers is:
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Correct answer: (A) 84
Refer to the following number and symbol series and answer the question that follows.
Counting to be done from left to right only. (All numbers are single-digit numbers only)
(Left) 2 # @ 1 4 ^ 8 9 + 2 ? $ 3 ^ 7 * 9 8 (Right)
How many such symbols are there, each of which is immediately preceded by a number
and also immediately followed by another number?
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Correct answer: (B) Four
What is the remainder when (x²−4x+7) is divided by (x−2)?
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Correct answer: (A) 3
The number 343264 is divisible by:
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Correct answer: (B) 32
This question is based on the five, three-digit numbers given below.
(Left) 694 874 742 459 648 (Right)
(Example- 697 – First digit = 6, second digit = 9 and third digit = 7)
What will be the resultant if second digit of the highest number is added to the third
digit of lowest number?
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Correct answer: (A) 16
The product of two consecutive natural numbers is 12. The greater of the two numbers
is:
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Correct answer: (B) 4
Which of the following bodies is described as the "real executive" in the Indian political
system?
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Correct answer: (D) Prime Minister of India
What is the constitutional consequence if the Lok Sabha passes a no-confidence
motion against the ruling government?
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Correct answer: (D) The Council of Ministers is obligated to step down
How to use these RRB JE Mathematics questions
Every question here was asked in a real RRB JE paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full RRB JE papers as timed tests to check your speed under exam conditions.