2= Ones' place 2= Tens' place 4= Hundreds' place 7= Thousands' place 8= Ten thousands' place 3= Hundred thousands' place
Now that you know the places, 387,422 can be rounded to 400,000. The reason why is because the (87) in 387 is closer to the next hundred. As you may know that anything 5 and greater can be rounded to the next hundred.