(70 minutes to complete)
I. Fill in the blanks (17)
(1)80700006400 is pronounced as (), and the mantissa after omitting "billion" is about () billion.
(2) written in 30.65 (), and its counting unit is ().
(3)38 hectares = () square meters 6 square kilometers = () hectares.
(4) One yuan for each pen. Xiaohua spent 20 yuan money to buy five such pens. The series of money to be returned is (). When a=3, you should get back () yuan.
(5)6a+8a=(+)a, and the law () applies here.
(6) In multiplication, one factor remains unchanged, and the other factor is enlarged by 3 times, and the product is ().
(7) One fifth and one eighth, () big.
(8) In 0.065, 0.605, 0.65 and 0.056, the maximum number is () and the minimum number is ().
(9) The base of the triangle is 8 cm, the height is 4 cm, and the area is () square cm.
The approximate value of (10) is 15.3, and the largest value is ().
(1 1) Uncle Li surrounded a trapezoidal nursery along the wall (as shown in the picture), with a fence of 23 meters long and an area of () square meters.
5 meters
Please be the referee (tick "√" correctly and "×" wrongly) (5 points).
(1) Add "0" or remove "0" at the end of a number, and the size of this number remains unchanged. ( )
(2) An equation with an unknown number is an equation. ( )
(3) Triangles with the same area must have the same shape. ( )
(4) Divide a circle into five parts, each part is one fifth of the circle ()
(5)0.5, 0.50 and 0.500 are equal in size, but the counting units are different. ( )
Third, sit in the right place (the serial number of the correct answer is in brackets) (10)
(1)4994800 is rounded to ten thousand places, which is about ().
A, 4.9 million B, 5 million C, 4.99 million.
(2) In the following formula, () is an equation.
a、36x+ 18x B、5600÷70 = 80°C、3x+6= 18
(3) The area of an ordinary room is 15 ().
A, hectare b, square kilometer c, square meter
(4) Xiaoming and Xiao Liang had a slow bike race and walked the same distance. Xiaoming took 1.8 minutes, and Xiao Liang took 2 minutes. () The result is good.
A, Xiao Ming B, Xiao Liang C, there is no comparison.
(5) The base of the parallelogram is reduced by 2 times, and the height is expanded by 2 times, with an area of ().
A, constant B, 2 times larger C, 2 times smaller.
Four, see who is accurate (***32 points)
(1) Direct calculation accuracy (4 points)
700÷ 100= 400÷200= 850-280= + =
240×400= 8400÷400= 720+280= - =
(2) Vertical calculation and checking calculation (4 points)
①86400÷240 ②285×300
(3) Solving equations (8 points)
①296-3x = 152②75+x-25 = 100
③x-(98-27)= 15④8x÷5 = 16
(4) Calculation of parting
①260+6 12÷ 12×4 ②4 12÷(607-36× 14)
(5) Word games (8 points)
① The sum of 3 times of x and 12 is 45, so find x.
② Use equation to find the value of x in the graph. (Unit: cm)
x
14 252 cm2
16
V. Operational problems (6 points)
(1) rectangle is shaded.
(2) Divide a circle into 16 equal parts and fold it at least () times.
Six, solve the problem (5 points per question, ***30 points)
1. Four rows of poplars, a total of 15, and some pine trees have been planted in the campus, so there are 1 15 poplars and pine trees in the campus. How many pine trees are planted on campus? (Equation solving)
2. Xinmin Village wanted to dig an 840-meter-long canal, which took five days, with an average of 80 meters per day. The rest will be dug in four days. How many meters do you dig every day on average?
3. The temperatures measured by the school meteorological team every 8 hours, 12 hours and 16 hours are 25 degrees Celsius, 29 degrees Celsius and 27 degrees Celsius respectively. Find the average temperature of this day.
4. Two engineering teams jointly built a highway, team A built a fifth, and team B built a fifth more than team A. How many canals have these two teams built?
A rectangular wheat field is 400 meters long and 250 meters wide. If 96 tons of wheat are harvested per hectare, it is planned to harvest 65,438+0,000 tons of wheat this year. Can you finish the task?
6. The school organized teachers and students to watch movies, with 860 students and 24 teachers. The theater ticket office said:
Today's release
Harry Potter 3
Adult tickets: 10 yuan each.
Student Tickets: Each 5 yuan.
Group tickets: each 6 yuan.
Groups of more than 40 people (including 40 people) can buy.
ticket
Please design the most economical ticket purchase scheme and work out how much it costs to buy a ticket. (2 points can be added for one more design scheme)
answer