4200 hectares = () square kilometers 4700 square centimeters = () square decimeter.

2. Fill in the appropriate unit name in brackets.

(1) The area of the math exercise book is about 4 ().

China's land area is about 9.6 million ().

(3) My stride is about 30 ().

(4) The classroom door is 2 () high and 2 () in area.

3. Use scores to represent colored parts.

( ) ( )

4. There are 28 students in Class Three (1), including girls (12), girls () and boys ().

5. There are 1 white balls, 2 red balls and 3 yellow balls in the box. 1 can be touched at will, and there are () results, with the greatest possibility of touching () ball and the least possibility of touching () ball.

6. The circumference of a square is 24 meters, the side length is () meters and the area is () square meters.

7.250×8, and there are () zeros at the end of the product.

8. Xiaoming is 10 years old. His grandfather is more than six times his age. He is 4 years old and his grandfather is () years old.

score

commentator

Second, the judgment (5 points)

1. The steering wheel of the train moves in translation.

2. The quotient of two digits multiplied by two digits must be four digits.

3. Square is a special rectangle.

A square with equal circumference and a rectangle have equal areas.

5. The perimeter and area of a square with a side length of 4 cm are equal.

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commentator

Three, choose the correct answer to fill in the brackets (5 points)

The quotient of 1 480÷2÷4 equals () of the formula.

A.480℉8° b . 480℉6°c . 480℉5°

2. The height of Xiaojun is 145 ()

decimetre

3. Make a rectangle with two squares with a side length of 3 cm. The circumference of this rectangle is ().

A.24 B.18cm C.12cm

4.4 teams, every two teams have a game. Team * * * competition ().

A. 12

5. A square with a side length of12cm and an area of ().

A.24 cm2 B.36 cm2 C.48 cm2