The famous teacher measures and controls the answers in the second volume of the fourth grade of mathematics.

First, fill in carefully (20 points)

1, letters indicate that the multiplication distribution law is ().

2.0.28 has () 0.0 1, 1 yuan 2.4 points, and the decimal is () yuan.

3. The angle of160 degrees is smaller than the right angle by () degrees.

4. Expand by 0.36 to 100 times, and move the decimal point to the left by one place.

5. Move the decimal point 0. 126 to the right by two digits (), and move the decimal point () to the left by three digits is 0.0068.

6. In a right triangle, one acute angle is 550 and the other acute angle is ().

7. Tintin and Dongdong set up a square with toy figures, with 13 on both sides of the outermost layer. There are () toy people in the outermost layer, and there are () toy people in the whole square.

8. According to the fact that the sum of the internal angles of the triangle is 180, find the sum of the internal angles of the following two figures.

Trapezoidal () degree, pentagonal () degree.

9. The number consisting of four ones, eight tenths and six thousandths is (), which is pronounced as ().

10, after rounding, a two-digit decimal is 9.5, and the maximum of this two-digit decimal is (), and the minimum is ().

1 1, 9020kg = () tons, 32.76km = () kilometers () meters.

5 m 20 cm = () cm

2. Accurate judgment (4 points) (tick "√" for the right and "×" for the wrong)

1, zero is added or removed after the decimal point, and the size of the decimal point remains unchanged. ( )

You can form a triangle with three sticks with lengths of 4cm, 6cm and 9cm respectively. ( )

The second number to the right of the decimal point is the percentile. ( )

4、 13 1-63+37= 13 1-(63+37)。 ( )

5. More than 2.4 and less than 2.6 have only one decimal place. ( )

Third, choose carefully (6 points) (put the serial number of the correct answer in brackets)

1, decimal 20.090 is simplified as ().

A, B, C, 2.9

2, 4.03 expanded to 100 times is ().

0.043 B、403 C、40.3

3. The two triangles of () can form a parallelogram.

A, equal bottom, equal height, equal area, exactly the same.

4, 0.72 is equal to ().

a、0.720 B、7.2 C、72 1000

5, in the following figures, can read two "zero" number is ().

a、20 1008 B、300.06 C、805.07 D、 190.07

6, 4 and 0.72 are equal to ().

a、0.720 B、7.2 C、72 1000

Four, careful calculation (***35 points)

1, please calculate. (8')

0.38+0.06= ( 155+20)-65= 64.2+5.7= 543-27-73=

0.97-0.09= 12.8-9.86= 17.05-4.58 = 9800÷25÷4=

3.5+0.6= 5-0. 15= 4.35+5.36= 99×66+66=

0.8 1+0.09= 0÷78= 50-20÷5= 35×25×4=

2. Please use recursive equation to calculate. ( 12')

72-3×8÷6 3600÷(20-5) (450+27) ÷(2 1- 18)

86.7-( 14.3-3.8 ) 60-( 12.87+0.75) 95.6-(26.3-8.3)

Can you think of a simple way to calculate the following questions? ( 12')

25×5+74×5+5 6.74+ 12.62+24.38+3.26

87-2. 123-0.877 30.65-(7.65+5.4)

(40+8)× 125 32×38+32×62

Five, the amount of painting (***8 points)

Mark the location of each building on the floor plan according to the little girl's description.

Six, solve the problem (1-5 questions each 4 points, 6 questions 6 points, ***28 points)

1 On Children's Day, Mr. Wang bought costumes for children's performances and bought three T-shirts and five pairs of shorts with the same money. 39 yuan, how much is each pair of shorts and each T-shirt?

Xiaolan's mother took 50 yuan to buy food. Buy meat dishes 28.75 yuan, buy vegetarian dishes 6.35 yuan. still

How much is left?

The school canteen sent 8 bags of rice and 8 bags of flour, 50 kilograms of rice and 25 kilograms of flour each. A * * *, send how many jins of food?

4. Dongdong's weight is 38kg, my cousin's weight is half of his, and my grandfather's weight is four times that of my cousin. How many kilograms does grandpa weigh?

5. In the first week, the road team built a section of road for 6 days, with an average of 100 meters per day. The second week will be completed in four days, with an average of120m per day. How long is this road?

6. From 2002 to 2006, the average computer ownership per 100 households in Binjiang Community is shown in the following figure.

(1), the average ownership per 100 households in Binjiang Community increased by () units from 2002 to 2006.

(2) From () to (), the average number of computers increased the least. The average number of computers has increased from () to ().

(3) According to the information on the map, you can predict that there will be about () computers per 100 people in Binjiang District in 2007.

Take the exam and answer questions.

First, fill it out carefully.

1.30、5,5、30, 1、2、3、4、6、8、 12、24

2. Odd numbers: 1, 3 1, 57 prime numbers: 2,31composite numbers: 28,57,86.

3.67, acute angle, isosceles

4.① ml ② l

5. 17,9

6.×3,÷3