Numerical Aptitude Tests Questions and Answers


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The sum of first five prime numbers is:


A. 11
B. 18
C. 26
D. 28

Answer & Explanation:

Answer: Option D

Explanation: Required sum = (2 + 3 + 5 + 7 + 11) = 28.

Note: 1 is not a prime number.

Definition: A prime number (or a prime) is a natural number that has exactly two distinct natural number divisors: 1 and itself.



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The difference of two numbers is 1365. On dividing the larger number by the smaller, we get 6 as quotient and the 15 as remainder. What is the smaller number ?


A. 240
B. 270
C. 295
D. 360

Answer & Explanation:

Answer: Option B

Explanation: Let the smaller number be x. Then larger number = (x + 1365).

x + 1365 = 6x + 15

5x = 1350

x = 270

Smaller number = 270.



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72519 x 9999 = ?


A. 725117481
B. 674217481
C. 685126481
D. None of these

Answer & Explanation:

Answer: Option A

Explanation: 72519 x 9999 = 72519 x (10000 - 1)

= 72519 x 10000 - 72519 x 1

= 725190000 - 72519

= 725117481.



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If the number 517 * 324 is completely divisible by 3, then the smallest whole number in the place of * will be:


A. 0
B. 1
C. 2
D. None of these

Answer & Explanation:

Answer: Option C

Explanation: Sum of digits = (5 + 1 + 7 + x + 3 + 2 + 4) = (22 + x), which must be divisible by 3.

x = 2.



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The smallest 3 digit prime number is:


A. 103
B. 107
C. 113
D. None of these

Answer & Explanation:

Answer: Option D

Explanation: The smallest 3-digit number is 100, which is divisible by 2.

100 is not a prime number.

√101< 11 and 101 is not divisible by any of the prime numbers 2, 3, 5, 7, 11.

101 is a prime number.

Hence 101 is the smallest 3-digit prime number.



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