118.380 to the nearest hundred is 100
The 1 that I underlined represents the hundreds place of a number, and since the number in the tens place ex.) 212.31 is also a 1, then you round down to just 100.
ex.) round to the nearest hundred: 492.341 The answer to this would be 500, since the number in the tens place is a 9 so you round up to the next hundred.