1. Cube is also called (), which is a cuboid of ().

The greatest common divisor of 2.4 and 28 is (), and the least common multiple is ().

3. True score () False score.

4. A number has only () two divisors, and this number is called a prime number.

5. Divide () into several parts on average, and the number representing such a part or parts is called a score.

7. Fill in the appropriate score in () below.

25cm = () m 15000m2 = () ha。

1 ton 600kg = () ton 1 10 second = () minutes.

1400 ml = () 8 months = () years.

125 cubic centimeter = () liter = () cubic decimeter.

8. put ">"

Second, the judgment (6 points)

1. False scores are all greater than 1. ( )

2. The least common multiple of two numbers must be divisible by these two numbers. ( )

3. The product of prime number and prime number is still prime number. ( )

4. All even numbers are composite numbers. ( )

5. The commutative law and associative law of integer addition are also applicable to fractional addition. ( )

Third, choose

1. 1-20 has () which is both complex and odd.

A. 1

2. Put 5g of sugar into100g of water, and sugar accounts for () of sugar water.

There is ().

A.5 B.6 C.7

Six, application questions (5 points per question, ***40 points)

1. There are 49 students in one class, including 2 boys1. What percentage of boys are in this class? What percentage of girls are in the class?

2. There is a swimming pool with a length of 25m, a width of 12m and a depth of1.4m. How many square white tiles do you need?

This cuboid reservoir has 2 100 cubic meters of water. This reservoir is 50 meters long and 20 meters wide. How deep is it?