Playing With Numbers

65. Numbers having more than two factors are called

  • (A) Prime numbers
  • (B) Co-prime numbers
  • (C) Even numbers
  • (D) Composite numbers

64. The sum of two odd and one even numbers is

  • (A) Even     
  • (B) Odd      
  • (C) Prime    
  • (D) Composite

63. Which of the following statements is not true?

  • (A) Both addition and multiplication are associative for whole numbers.
  • (B) Zero is the identity for multiplication of whole numbers.
  • (C) Addition and multiplication both are commutative for whole numbers.
  • (D) Multiplication is distributive over addition for whole numbers.

62. Two numbers having only 1 as common factor are called

  • (A) Prime numbers        
  • (B) Co- prime numbers
  • (C) Composite numbers 
  • (D) Odd numbers

61. Which of the following statements is not true?

  • (A) The HCF of two distinct prime numbers is 1
  • (B) The HCF of two co prime numbers is 1
  • (C) The HCF of two consecutive even numbers is 2
  • (D) The HCF of an even and an odd number is even

60. If a number is divisible two co-prime numbers, then it is divisible by their

  • (A) Sum also        
  • (B) Difference also
  • (C) Product also   
  • (D) Quotient also

59. The multiple of 2 are also called

  • (A) Even numbers
  • (B) Odd numbers 
  • (C) Prime numbers
  • (D) Composite numbers

58. Number of factors of a given number is/are

  • (A) 8
  • (B) Finite
  • (C) Infinite
  • (D) More than 8 but less than 28

57. Number of multiples of a given number is/are

  • (A) 48
  • (B) Finite
  • (C) Infinite
  • (D) More than 48 but less than 78

56. The numbers having exactly two factors are called

  • (A) Even     
  • (B) Odd      
  • (C) Prime    
  • (D) Composite

55. The numbers having more than two factors are called

  • (A) Prime numbers        
  • (B) Composite numbers
  • (C) Even numbers
  • (D) Odd numbers

54. A number for which sum of all its factors is equal to twice number is called

  • (A) Perfect number
  • (B) even number  
  • (C) Odd number  
  • (D) Prime number

53. The HCF of two numbers is 

  • (A) ≤ the smaller number        
  • (B) ≥ the bigger number          
  • (C) ≥ the smaller number        
  • (D) ≤ the bigger number

52. The LCM of two or more given numbers is the lowest of their

  • (A) Common Factors      
  • (B) Common Multiples  
  • (C) Common divisors     
  • (D) None of these

51. The HCF of two or more given numbers is the highest of their

  • (A) Common Multiples  
  • (B) Common Factors     
  • (C) Multiples        
  • (D) None of these

50. The product of L.C.M and H.C.F. of two numbers is equal to

  • (A) Sum of numbers      
  • (B) Difference of numbers
  • (C) Product of numbers 
  • (D) Quotients of numbers

49. What is the H.C.F. two consecutive even numbers

  • (A) 1 
  • (B)2  
  • (C) 4 
  • (D) 8

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