Question

78 990 e divisivel por 9

Answer 1

$\large\boxed{\begin{array}{l}\sf um\,n\acute umero\,\acute e\,divis\acute ivel\,por\,9\,quando\\\sf a\,soma\,dos\,algarismos\,resulta\\\sf em\,um\,n\acute umero\,que\,divide\,9.\\\sf 78~990=7+8+9+9+0=33\\\sf como\,33\,n\tilde ao\,divide\,9,ent\tilde ao\,78990~n\tilde ao\,divide\,9.\end{array}}$