Respuesta :

1/3 of 21 is 21/3
If you cancel down 21/3 you would get 7
you can check your by multiplying 7 by 3 which is 21
1/3 of 21 is 21/3 if tou simplify it which is dividing 21 divided by 7 you would get 3 which you know that your correct hope.this helps:)