4th Class Mathematics Factors and Multiples Question Bank Multiples and Factors

  • question_answer
    Direction: Factors of a number which are prime are called its prime factors. Factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18. Prime factors of 36 are: 2, 3. A number can be written as a product of its prime factors, e.g.\[36=2\times 2\times 3\times 3\]. A factorization in which every factor is prime is called prime factorization of the number. Two numbers are co-prime if they have only 1 as the common factor. Based on the information given above answer the following questions. Which one of these are co-primes?

    A) 24, 32                         

    B) 18, 12         

    C) 9, 16   

    D) 60, 84

    Correct Answer: C

    Solution :

    9, 16 are co-primes \[9=3\times 3\] \[16=4\times 4\] 9 and 16 have only 1 as the common factor.                          


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