900 The digit in the 'hundreds' place is the
9
The nearest hundred will, therefore, be either 900 or 1000
A number less than 950 will round down, while a number from 950 upwards will round to 1000
We need to look at the digit in the 'tens' place to know whether we will round up or down. The digit in the '10s' place is 4.
949 is less than 950 so you round down to 900