To solve this, we must first know what the "hundreds place" is. This is the number that is 3 to the left of the decimal, and in this case, is the 4.
To round a number, we should look at the value before the place we are rounding to. If it is 4 or lower, we leave the number the same, while if it is 5 or higher, we raise it by 1.
In this case, the number before the 4 is 3, which is less than 5. Therefore, 435 rounded is 400.