Current location - Training Enrollment Network - Mathematics courses - Fill in the appropriate unit name in brackets. The cover area of a math book is about 230 _ _ _ _ _. The area of a piece of art paper is about 4 _ _ _ _ _ _ _ _ _ _ _.
Fill in the appropriate unit name in brackets. The cover area of a math book is about 230 _ _ _ _ _. The area of a piece of art paper is about 4 _ _ _ _ _ _ _ _ _ _ _.
The cover area of this math book is about 230 square centimeters.

The area of a piece of art paper is about 4 square decimeters.

The area of a classroom is about 63 square meters.

The territory of our country is about 9.6 million square kilometers.

So the answer is: square centimeter, square decimeter, square meter, square kilometer.

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