Numbers Questions and Answers updated daily – Aptitude



25 Numbers Questions and answers section with explanation for various online exam preparation, various interviews, Aptitude Numbers online test. Numbers Questions with detailed description, explanation will help you to master the topic.

Numbers Questions

1.      666 � 6 � 3 = ?



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Correct Ans:37
Explanation:


2.      The sum of first 45 natural numbers is:



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Correct Ans:1035
Explanation:


3.     35 + 15 x 1.5 = ?



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Correct Ans:57.5
Explanation:


4.    Which one of the following can't be the square of natural number ?



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Correct Ans:42437
Explanation:
The square of a natural number never ends in 7.

42437 is not the square of a natural number.


5.     In a division sum, the remainder is 0. As student mistook the divisor by 12 instead of 21 and obtained 35 as quotient. What is the correct quotient ?



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Correct Ans:20
Explanation:

Number = (12 x 35)

Correct Quotient = 420 � 21 = 20



6.     Which one of the following numbers is completely divisible by 99?



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Correct Ans:114345
Explanation:
99 = 11 x 9, where 11 and 9 are co-prime.

By hit and trial, we find that 114345 is divisibleby 11 as well as 9. So, it is divisible by 99.


7.   If a and b are odd numbers, then which of the following is even ?



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Correct Ans:a+b
Explanation:
The sum of two odd number is even. So, a + b is even.


8.   The difference between the place value and the face value of 6 in the numeral 856973 is



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Correct Ans:5994
Explanation:
(Place value of 6) - (Face value of 6) = (6000 - 6) = 5994


9.    The sum all even natural numbers between 1 and 31 is:



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Correct Ans:240
Explanation:
Required sum = (2 + 4 + 6 + ... + 30)

This is an A.P. in which a = 2, d = (4 - 2) = 2 and l = 30.

Let the number of terms be n. Then,

tn = 30 a + (n - 1)d = 30

2 + (n - 1) x 2 = 30

n - 1 = 14

n = 15

Sn = n /2 (a + l) =15 /2x (2 + 30) = 240.




10.    (4300731) - ? = 2535618



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Correct Ans:1775123
Explanation:
Let 4300731 - x = 2535618

Then x, = 4300731 - 2535618 = 1765113


11.    Which of the following numbers is divisible by each one of 3, 7, 9 and 11?



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Correct Ans:2079
Explanation:
639 is not divisible by 7

2079 is divisible by each of 3, 7, 9, 11.


12.   If the number 42573 * is exactly divisible by 72, then the minimum value of * is:



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Correct Ans:6
Explanation:
72 = 9 x8, where 9 and 8 are co-prime.

The minimum value of x for which 73x for which 73x is divisible by 8 is, x = 6.

Sum of digits in 425736 = (4 + 2 + 5 + 7 + 3 + 6) = 27, which is divisible by 9.

Required value of * is 6.


13.     A number when divided by 296 leaves 75 as remainder. When the same number is divided by 37, the remainder will be:



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Correct Ans:1
Explanation:
Let x = 296q + 75

= (37 x 8q + 37 x 2) + 1

= 37 (8q + 2) + 1

Thus, when the number is divided by 37, the remainder is 1.


14.    -84 x 29 + 365 = ?



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Correct Ans:-2071
Explanation:
Given Exp. = -84 x (30 - 1) + 365
= -(84 x 30) + 84 + 365
= -2520 + 449
= -2071


15.   If the product 4864 x 9 P 2 is divisible by 12, then the value of P is:



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Correct Ans:none of the above
Explanation:
Clearly, 4864 is divisible by 4.

So, 9P2 must be divisible by 3. So, (9 + P + 2) must be divisible by 3.

P = 1.


16.   On dividing a number by 56, we get 29 as remainder. On dividing the same number by 8, what will be the remainder?



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Correct Ans:5
Explanation:


17. If the number 481 * 673 is completely divisible by 9, then the smallest whole number in place of * will be:



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Correct Ans:7
Explanation:
Sum of digits = (4 + 8 + 1 + x + 6 + 7 + 3) = (29 + x), which must be divisible by 9.

x = 7.


18. Which of the following is a prime number ?



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Correct Ans:97
Explanation:
Clearly, 97 is a prime number.


19. What least number must be added to 1056, so that the sum is completely divisible by 23 ?



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Correct Ans:2
Explanation:
23) 1056 (45
92
---
136
115
---
21
---
Required number = (23 - 21)
= 2.


20. Which one of the following is not a prime number?



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Correct Ans:91
Explanation:
91 is divisible by 7. So, it is not a prime number.



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