Know the relative size and place value structure of positive and negative integers and decimals to three places

I have been learning to round decimals to the nearest whole number and tenth 
Here are some examples    
1. Round 675.2803 to the nearest whole number = 675 
2. Round 44.648 to the nearest hundredth = 44.65
3. Round 28.03 to the nearest whole number = 28
4. Round 54.902 to the nearest tenth = 54.9

Next step : My next step is to round decimals to the nearest thousandths and ten thousandths