1. A number consists of seven percent, eight tenths and four thousandths. This number () is pronounced ().

2. The maximum counting unit of decimal part is (), and the minimum counting unit of integer part is ().

3. Divide a whole into 10 parts on average, and write such 4 parts as fractions () and decimals ().

4. Add "0" or () "0" to the decimal (), and the size of the decimal remains unchanged, which is the so-called nature of the decimal.

5.0.9 contains () in ten, 0.09 contains () in percent, 0.45 contains () in percent, and 0.003 contains () in thousandths.

6. Simplify 0.60 to () and 0.60500 to ().

7. Without changing the number size, rewrite 9.4 as () with three decimal places, and rewrite 8 as () with two decimal places.

8. Read and write the following numbers.

12.3020 pronounced ()

537.06 is pronounced as ()

6009.004 is pronounced as ()

Write 0801 ()

15.04 Writing ()

Second, the judgment question. (Draw "√" on the right and "×" on the wrong)

1. 1.40 is the same size as 1.4000, but different counting units have different meanings. ( )

2. Integer must be greater than decimal. ( )

3. Five decimal places are not necessarily greater than three decimal places. ( )

4.0.08 means 8 0.0 1. ( )

5.30 0.0 1 and 3 0. 1 are equal. ( )

Third, multiple choice questions. (Put the serial number of the correct answer in brackets)

1. The number that rewrites 8 yuan's 3 points into yuan is (). (1)8.3 yuan 20.83 yuan 38.30 yuan 48.03 yuan.

2. In the following figures, all zeros have been removed, and the one that does not change the size is ().

( 1) 1008.002 (2)3.060 (3)0.900 (4)6.5000

3.0.87 is equal to () one thousandth.

( 1)87000 (2)8700 (3)870

4.58 mm is equal to () meters.

( 1)0.58 (2)0.058 (3)0.0058

5. The tenth digit of a number is 5, the hundredth digit is 7, the tenth digit is 3, the thousandth digit is 9, and everything else is 0. This number is written as ().

( 1)9300.57 (2)90305.7 (3)9030.57

Fourth, the order.

1. Sort the following numbers in descending order.

0.69 0.509 6.5 5.9 9.5 9.05

2. Arrange the following figures in descending order.

7.0059 7.9005 7 7.0095 7.0509 7.5009

Please write a number with four numbers 0, 0, 2 and 8 and the decimal point according to the following requirements.

1. The integer part is three decimal places of 0.

2. Read only two decimal places of a "zero".

3. A decimal place that doesn't read "zero".

4. To read two decimals of zero.

6. Mathematics in life.

1. The area of a parallelogram with a base of 32 decimeters is equal to the area of a square with a side of 24 decimeters. Find the height of this parallelogram.

2. A trapezoidal field, with an upper bottom of 40 meters, a lower bottom and a height twice that of the upper bottom. 1200 trees have been planted on this land. How many square meters does each tree cover on average?

3. A triangle vegetable field receives 480 kilograms of vegetables, and it is known that it receives 8 kilograms of vegetables per square meter. The base of the triangle is 40 meters. How many meters is it?