Question

12:6=
15:10=

40:30=
40:50=

Answer 1

12:6  = 6 * 2/ 6 = 2
15:10 = 3*5 / 2*5 = 3/2
40: 30 = 4 *10 / 3*10  = 4/3 * 10/ 10 = 4/3 * 1 = 4/3
40:50 = 4 * 10 / 5 *10 = 4/5 * 10/10 = 4/5

*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Obrigado pela oportunidade 
Boa sorte, bons estudos!
SSRC - ♑ - 2015 
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

Answer 2

            Pelo procedimento convencional
      
                                12 | 6   
                                12     2
                                 0                12 : 6 = 2 exato

                                15 | 10   
                                10    1
                                  5
                                                   15 : 10 = 1 resto 5

                                 40 | 30   
                                 30  1
                                 10
                                                    40 : 30 = 1, resto 10

                                 40   | 50   
                                 400 0,8          40 é menor que 50
                                 400                acrescenta 0 no dividendo
                                   0                  coloca 0 no quociente
                                                   40 : 50 = 0,8