Answer:
400
Explanation:
rounding to the nearest hundred, in bold you'll see the hundred place.
418.953
The number next to that (right side →) determines if it stays 4 or goes one number up, 5.
If it's 4 or lower is stays the same
and
If it's 5 or higher (up to 9) it increases by 1.
so
because the number next to it is a 1, it stays 4.
Therefore 400 is the answer.