1. Oral calculation (65438+ 0 points for each question, ***8 points)
20×34= 3200÷400= 183-99= 25×80=
162+98= 1000÷8= 109×99×0= 9×5÷5×9=
2. External calculation, simple calculation if it can be simplified. (3 points for each question, *** 18 points)
45×[( 1 100- 180) ÷40] 102×38 98× 10 1-98
42 1- 175-25 25×32× 125 360×52+480×36
Second, choose (fill in the serial number of the correct answer in brackets, each entitled 1, and ***8)
3 Multiply two numbers, one multiplier is unchanged, the other multiplier is expanded by 3 times, and the product ().
A, 3 times smaller B, 3 times larger C, unchanged
4.34 □ 9041≈ 3.5 million, □ Fill in ().
A.0 B.9 C.4
5. If the smallest angle in a triangle is greater than 45, then this triangle is a () triangle.
A. acute angle B. right angle C. obtuse angle
6. It is estimated that your age is closest to ().
A, 540 hours b, 540 weeks c, 540 months
7. After the rectangular box is drawn into a parallelogram, its perimeter ().
A. the longer B. the shorter C. the same
8. Xiaoyu's sitting position in the class is (3,2), so his deskmate should be ().
A.(3，3) B. (4，2) C. (2，2)
9. The lengths of two adjacent sides of an isosceles triangle are 4 cm and 8 cm respectively, and the circumference of this triangle is () cm.
A. 16 or 20
10. If △+○= 10, then the number of 73×△+73×○ is ().
1460
Three. Fill in the blanks (65438+ 0 points for each question, ***23 points)
1 1.3 The number consisting of tens, 500, 600 tens and twos is (), which is pronounced as ().
12. put ">" in ○. 、“& lt、"="。
450×5 ○ 40×55 234-78÷26 ○(234-78)÷26
490,005,400,040,400, 19999,020,000,000.
13. The mantissa after the total population of a city is about 960,000, and the city has at most () people and at least () people.
14. A triangle has at most () obtuse angles and at least () acute angles.
15. The waist length of the isosceles trapezoid is 6 cm, the upper bottom is 2 cm, and the lower bottom is 4 times the length of the upper bottom. It takes at least () cm of wire to surround this trapezoid.
16. On average, about 140 babies are born every minute in the world, and about () babies are born every hour.
17. The largest six digits composed of 8, 6, 7, 0, 5 and 1 are (), and the smallest six digits are (); The largest four digits are less than the smallest six digits ().
18. The base angle of the isosceles triangle is 70 and the top angle is () degrees; If its top angle is 70 degrees, its bottom angle is () degrees.
19. The sum of the internal angles of the quadrilateral is (), and the sum of the internal angles of the dodecagon is ().
20. In the mid-term exam, the average score of Li Ming's Chinese, math and English is 94, of which the average score of Chinese and math is 95, so his English score is ().
One side of the 2 1. triangle is 7 cm long, the other side is 3 cm long, and the third side must be greater than () cm and less than () cm.
22. Draw a trapezoid in a rectangle 8 cm long and 6 cm wide. The maximum height of a trapezoid is () cm.
Iv. Operation and inquiry (* *12)
23. Draw a picture (***3 points)
(1) Draw the height of the trapezoid. (2) Draw the heights of two different bases in the parallelogram below.
24. Fill in the blanks and draw pictures as needed. (2+ 1+2+5 points.
(1) is represented by several pairs, where the position of point B is () and the position of point C is ().
(2) Move the triangle up by 5 squares and draw a graph.
(3) Rotate 90 clockwise around point B and draw a graph. ..
25. Draw with the following parallel lines as needed. (4 points)
(1) Draw a right triangle with a base length of 3cm (the vertex is on another line).
(2) Draw a parallelogram with a base length of 2 cm.
V. Solving practical problems (***3 1 point)
26. Students in Class Three, Grade Four make paper flowers to celebrate New Year's Day. Class One made 85 flowers, Class Two made 4 more flowers than Class One, and Class Three made as many as Class One. How many flowers did each of the three classes make? (Draw a line diagram according to the meaning of the question before solving it) (5 points)
27. The distance between Party A and Party B is 360 kilometers. At 8 o'clock in the morning, two cars came to each other at the same time. When will they meet? (5 points)
28. The length of the rectangular flower bed is 20 meters. If the length is increased by 5 meters and the width remains the same, the flower bed area will increase by 30 square meters. What is the area of the flower bed after the length is increased? (Draw first, then answer) (5 points)
29. The school sent Mr. Li to the store to buy 35 footballs. Two stores, each in 45 yuan, are now engaged in preferential activities. (9 points)
(1) Store A stipulates that 5 yuan will be given a discount of 10 or more. How much does it cost to buy * * * in Store A?
(2) Store B stipulates that if you buy 10, you can get 1, and if you buy more, you can get more. How much does it cost to buy * * * in store B?
(3) Which store is more cost-effective? How much money can you save than buying in other stores?
30. Jun Jun and his brother went to the amusement park, and each paid 6 yuan for the first hour, and then 8 yuan every hour. After the play, the two handed it over to 64 yuan. How many hours did they play in the amusement park? (5 points)
3 1.(2 points) Given that a+b=200 and a-b= 120, then a+(b+20)=.
a-(b- 10)= .