Условие:

7 $к{м}^2$ = ☐ ${м}^2$;
800 $д{м}^2$ = ☐ ${м}^2$.

7 $к{м}^2$ = 7 * 1000000 = 7000000 ${м}^2$;
800 $д{м}^2$ = 800 : 100 = 8 ${м}^2$.