Divisor and Multiple Basic Math Problem

Divisor and Multiple Basic Math Problem

mkshdfsk_160912_1


  • We are trying to make a square number by multiplying the smallest natural number to . Which natural number should be multiplied?
solution :

Prime factorization  . To make a square number all indexes are even number. So we must multiplying  and .

Answer : 

 


  • What is the number that has the most factor among these numbers?

(1)      (2)      (3)      (4)      (5) 

solution :

To find the number of factor, 1) Prime factorization 2) all index number  3) and plus that new numbers.

(1)   index  so number of factor of  is 

(2)  index  , number of factor of  is 

(3)  index  , number of factor of  is 

(4)   index  , number of factor of  is 

(5)  index ,  number of factor of  is 

Answer :  (4)