The hundreds column is the 3rd digit to the left of the decimal point, in this case it's the 1.
Look at the number 1 to the right of it. If its 5 or above, you round the number up, if it's below 5 you leave it the same.
In this case the number after the 1 is another 1, so you don't round it up.
118.380 to the nearest hundred is 100