# Numbers

## Numbers

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Question 1 |

Which one of the following is not a prime number?

31 | |

61 | |

71 | |

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

2 | |

3 | |

18 | |

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 ?

33 | |

81 | |

93 | |

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:

11 | |

18 | |

26 | |

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 ?

240 | |

270 | |

295 | |

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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