Respuesta :

You would do 

7(60) + 7(3)

The 60 and 3 came from 63 

then to solve it you do

7(60) + 7(3)=
 420 + 21=
441
Using the distributive property:  x(a+b)=xa+xb

7(60) + 7(3) =
420 + 21 = 
441