If 448 is rounded to 450 and 450 is rounded to 500 does that mean 448 is rounded to 500 too?

NO

Step-by-step explanation:

Since you are rounding to a numbers in the 100s you need to find the closest multiple of 100 to 448, this would be 400 since the difference between 448 and 400 is 48 while the difference between 500 and 448 is 52 and 48<52