lo que es 40 x 21 dividido por 8 redondeado al décimo más cercano muestra el trabajo, así que sé que no solo usaste una calculadora

21

*40

       

     0

+840

       

840

    105  

       

 -80

           

       40

      -40

           

         0

=105

8 goes into 84 ten times, 84-80 =4  

Bring down the zero make 40 which 8 goes into five times

Step-by-step explanation:

cant be round because there no tenths place

TRANSLATION 8 entra en 84 diez veces, 84-80 = 4 Baje el cero, haga 40, en el que 8 entra cinco vecesno puede ser redondo porque no hay décimos, asegúrese de poner los números correctos

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.