Số 40 được phân tích thành các thừa số nguyên tố là:

$2340$                 

$2150$                      

$1490$                         

 Cả ba số trên.

$4$                 

$6$                      

$10$                         

$8$

$3$                                 

$4$                                 

$5$                                 

$6$                                 

$7$                                    

$16$                                    

$14$                                    

$12$                                    

$44$

$46$

$22$

$48$

$9$                             

$8$                                   

$5$                  

$6$