Respuesta :

The number in the tens place is 3.  The number after that is 6 which is greater than 5 so you round up.  Therefore 636 rounded to the nearest tens place is 640. 
The number in the hundreds is 6, the next number is 3 and since it is less than 5, you keep it at the same.  636 rounded to the nearest tens is 600.
The six at the end is one the 3 at the middle is ten and the six at the top is hundreds