# Numbers

## Numbers

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 Question 1
Which one of the following is not a prime number?
 A 31 B 61 C 71 D 91
Question 1 Explanation:
91 is divisible by 7. So, it is not a prime number.
 Question 2
What least number must be added to 1056, so that the sum is completely divisible by 23 ? A. 2 B. 3 C. 18 D. 21 E. None of these
 A 2 B 3 C 18 D 21
Question 2 Explanation:
1056 divide by 23 then reminer 21 Required number = (23 - 21) = 2.
 Question 3
Which of the following is a prime number ?
 A 33 B 81 C 93 D 97
Question 3 Explanation:
Clearly, 97 is a prime number. Number which divisible by only 1 and himself.
 Question 4
The sum of first five prime numbers is:
 A 11 B 18 C 26 D 28
Question 4 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.
 Question 5
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
Question 5 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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