Accurate to a certain place. This is a ballpark figure.

40 thousand, accurate to 10 thousand.

If it is written as 40000, it will be understood as accurate to one place.

If it is written as 4× 10 4, it is accurate to ten thousand places.

3500 is understood to be accurate to one place.

3.5 thousand is understood as accurate to 100.

3.5× 10 3 is understood as accurate to a hundred.

Hehe, Chinese is so rich that it can only be understood in this way.

Otherwise, you will see:

How to accurately express 3000.4 in one place? Of course it's 3000

3000 to 1000? It can only be 3000, or 3× 10 3.

I hope it helps you a little, hehe, there is no need to add points, look at the opinions of other friends.