Answer:
To round a number to the nearest 10, look at the amount of ones. If this is 5 or more, round up. ...
To round a number to the nearest 100, look at the tens digit. If the tens digit is 5 or more, round up. ...
To round a number to the nearest 1000, look at the hundreds digit. If the hundreds digit is 5 or more, round up.
Explanation: