First of all, think carefully and fill in the blanks carefully. (***22 points. )

1. Cut a 5-meter-long rope into 10 segments, each segment accounting for () meters of the total length.

2. The radius of the circle is enlarged by 2 times, the circumference by () times and the area by () times.

3, 35 liters = () ml 78.3 cubic decimeter = () cubic meters.

4. Fill in ">" < "=" in the box.

37 × 1 18 1 19 37 23 ÷4 173 23 3.5 35%

5.()÷ 8 = 12: () = 0.75 = 3 () = () (fill in percentage)

6. A circle has a () axis of symmetry and a rectangle has a () axis of symmetry.

7. Draw the largest circle in a rectangle with a length of 8 cm and a width of 6 cm. The area of this circle is ().

8. As shown in the right figure, a rectangle is evenly divided into eight squares, and the colored part in the figure accounts for ()% of the total area. If 37.5% of the total area is to be painted red, then () squares are painted red.

9.6 (3) Class 50 people arrived at school today, and 2 people called in sick. The absence rate of Class Six (3) today is ()%, and the attendance rate is ()%.

10, the relationship between () and () can be clearly expressed by the fan-shaped statistical chart.

Second, see the topic clearly and think skillfully. (*** 18)

1. Numbers written directly: (4 points)

67 × 56 = 3 10 ÷ 56 = 137 ÷26 = (23 )? =

2. Solving equations: (4 points)

4X + 12= 40 0.4X+25% X = 26

3. Simplify the following proportion and find the proportion: (4 points)

3.6: 9 (proportion) 45: 23 (simplified proportion)

4. Calculation of the following problems can be simplified. (6 points)

65 × 67 - 67 ÷5 74 ÷(23 + 12 )× 45

Third, choose carefully and choose the best among the best. (***5 points)

1, in the figure below, can be folded into a cube is ().

B.C.

2. Add 10g salt to 150g water, and the salt accounts for () of the brine.

a、B、 10% C、25%

3. Square, rectangle and circle have equal perimeters, and their area () is the largest.

A, square b, rectangle c, circle

4. Prepare a gift candy, and the mass ratio of toffee to chocolate is 5: 3. This gift candy should be prepared now. Toffee and chocolate each have 60 kilograms, so when all the toffee is used up, chocolate will ().

A, there is still B, not enough C, it is impossible to judge.

5. "Chickens and rabbits in the same cage" is one of the famous mathematical problems in ancient China. The title recorded in Sun Tzu's Art of War is this: "Today, there are chickens and rabbits in the same cage, with 35 heads above and 94 feet below. What are the geometric figures of chickens and rabbits? " Students, the result of this ancient famous question you got is ().

A, chicken 23 rabbit 12 B, chicken 12 rabbit 23 C, chicken 14 rabbit 2 1.

Fourth, carefully scrutinize and judge right and wrong. (***5 points)

1. An apple weighs 320kg, which means it weighs 15% kg. ( )

2. All the 98 parts made by Master Wang are qualified, and the qualified rate is 98%. ( )

3、A \ = B×= C+(A