First, the calculation problem
1. Numbers written directly.
1.9+ 1. 1= 2-0.98= 13.7+0.03= 4. 1-3.3= 4-0.04= 3.8-2.8=
7.9-0= 6-5.2= 0.7× 10= 3.005× 100= 60÷ 1000 1.52÷ 10=
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2. Calculate the following questions vertically and check them.
( 1)30.98+5. 12 (2) 12-7.64.
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3. Calculate the following questions as simply as possible.
( 1) 10.75-(2.4-0.86) (2)9.6 1-4.38+0.35
(3)3.87+4.92+ 1. 13 (4)46.24-8.66- 1.34
(5)2 1.9-9.22-0.78+8. 1 (6)(745-25× 16)÷ 15.
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2. Fill it in.
4. A triangle has two angles, 35 and 55 respectively, and its third angle is
.
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5. One acute angle of a right triangle is 45 degrees, and the other acute angle is
This right triangle is still
Triangle.
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6. The top angle of an isosceles triangle is 40, and the bottom angle is
.
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7. The four triangles A, B, C and D all know the degrees of the two angles respectively:
A: 50，80 B: 60，60 C: 40，20 D: 70，20。
According to the above information, we can know that:
Is an acute triangle,
Is a right triangle,
Is an obtuse triangle;
Is an isosceles triangle,
This is an equilateral triangle.
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8. Five colorful flags are inserted on each side of the square flower bed, and each vertex of the square has a 1 colorful flag. A * * was inserted around the flower bed.
Colorful flags.
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9. All students in grade six should take photos according to their personal documents. They are arranged in a row according to the order of class and numbered. The first student in Class 2, Grade 6 is No.46, and the last student is No.94. There are * * * students in Class 2, Grade 6.
student
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10. There is a 40-meter-long path between the two buildings. Now, you need to set a telephone pole every 8 meters on both sides of the path.
Telephone pole
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Three. True or false.
A triangle with two acute angles is called an acute triangle.
. (judging right or wrong)
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12. A triangle has at most one right angle.
. (judging right or wrong)
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13. Two identical triangles can be combined into a parallelogram.
. (judging right or wrong)
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14. The base angle of an isosceles triangle must be less than 90 degrees.
.
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Choose one.
15. The sum of the degrees of any two acute angles of an acute triangle must be ().
A. acute angle B. right angle C. obtuse angle
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16. The circumference of the circular skating rink is 320 meters. Now a lamp should be installed every 20 meters along this circle, and a * * * lamp should be installed.
15
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17. A triangle has two equal angles. It must be ().
A. isosceles triangle B. equilateral triangle C. acute triangle
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18. Xiaohong forms an isosceles triangle with a 40cm rope (the length of the collision between the two ends of the rope is ignored), and its base length is 12cm and its waist length is () cm.
A. 1 1 B. 14 C.28
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19. The two sides of the triangle are 2.6cm and 6.5cm respectively, and the length of the other side may be () cm.
A.3.4 B.8.2 C.9.2
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V. Answering questions
20. Draw the triangle below, specify the height on the bottom, and point out which of the three types the triangle is: acute triangle, right triangle or obtuse triangle.
Figure 1 Yes
triangle
Figure 2 is
Triangle.
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2 1. The following table is the statistics of the number of freshmen enrolled in Hongyun Primary School from 200/kloc-0 to 2006.
200 1 2002 2003 2004 2005 2006
Enrollment102108120138150186.
(1) Please complete the polyline statistical chart according to the data in the table.
As can be seen from the statistics, the number of freshmen is increasing year by year.
The trend. (Fill in "increase" or "decrease");
The freshmen with the largest enrollment are
People.
(3) Compared with the previous year,
The number of freshmen increased the most in 1999.
(4) In the past six years, how many people enrolled in school each year? (Column Solution)
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22. A newspaper subscription form in the school team office was stained. It is known that these three newspapers have exactly the same number of copies in the sixth grade. How many copies are subscribed to each newspaper?
Copy number
title
Total subscriptions of junior newspapers, science and technology newspapers and mathematics newspapers.
Grade 5 86 104 79 269
Grade?Six
The total count of newspapers and periodicals is 55 1
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23. 1990, the average life expectancy of China population is 68.55 years, and it will be 5438+0.44 years in 2006. In this 1 1 year, how many years has the average life expectancy of China population increased?