1. Fill in the blanks with 1. () One hundred is a thousand, and ten thousand has a thousand.

2. 1 km = () meters, 1 min = () seconds, 4000 cm = () decimeter.

3, choose the right unit to fill in ();

One child is 150 ()

Table height 7 ()

The time of a class is 40 ()

A railway is 1000 ()

4.3084 consists of () thousands, () tens and () ones.

5. Starting from the right, the third position is () and the fourth position is ().

6. A five-digit number, its digits are () digits, and the hundred digits are () digits.

7. Fill in > or < in ○.

1003○999

3968○400

1900g 02kg

8, 7903, 7930, 9730 and 973 are arranged in order from small to large:

()