1.90805300 is pronounced as (90805300), the unit of "ten thousand" is (90805300), and the mantissa after omitting ten thousand digits is about (90865438+ ten thousand).

2.4004.04 pronounced as (four thousand four point zero four), the third "4" from the left is in the position of (ten), indicating (three tenths).

3. Fill in the appropriate units in the brackets.

(1) The area of a classroom is 54 (square meters); (2) Xiaohong needs about 9 seconds to run 50 meters; (3) The speed of the car is 90 kilometers per hour; (4) The space occupied by a classroom is about 170 (m3).

4. There are (3,5,7) odd numbers and prime numbers in natural number 1 ~ 10, (2) even numbers and prime numbers, and (1) is neither prime nor even.

5.1/5 = 4/20 = 3 ÷ (15) = (1): (5) = (20)% = (0.2) (fill in decimal places).

6. Divide a 5m-long rope into 9 segments, each segment is 1/9, and each segment is 5/9m long. 7.0.8: The ratio of the simplest integer is (), and the ratio is ().

8. A two-digit number divisible by 2, 3 and 5 at the same time. The minimum quantity is (30).

The multiple of 9.5 is 3(5X+3).

10. In the table below, if X and Y are directly proportional, "?" Fill in (); If x and y are inversely proportional, "?" Fill in (). x 4？ y 12 24

1 1. From small to large 1.707, 1.07, 17.7% and 1.7( 1.707,/kloc)

12. In primary school, we knew many numbers. Let's give examples of negative numbers and percentages in daily life (one each): (-2, 25%).

13. Give an example that two quantities are inversely proportional in life: (When the distance is constant, time is inversely proportional to speed).

Second, judge right or wrong.

1. The diameter of the circle is a straight line. (error)

2. A cylindrical lead block is cast into a cone, and its volume remains unchanged. (right)

3. In an acute triangle, if one angle is 30 degrees, the other two angles can be 55 degrees and 95 degrees. (wrong).

4. The ratio of the bottom areas of two cylinders with the same height is 3: 2, so the ratio of the volumes is 3: 2. (right)

5. The rectangle takes one side as the axis, and the rotating body obtained by one rotation is a cylinder. (Right) Third, multiple-choice questions.

1. If the ground at 1 m2 is full, you can stop at (c) a.30b.3c.10 d.100.

2. Only one set of parallelograms has (C) in two groups of opposite sides. A. square B. rectangle C. trapezoid D. parallelogram

3. The rectangle is 5cm long and 3cm wide, indicating the score of (). Length is greater than width. B. the width is greater than the length. C. the width is less than the length. D. the length is less than the width. "This is a pig's trotters-pig's problem! ! ! 》

4. The cylinder and the cone have the same height, and the sum of their volumes is 48 cubic decimeters. The volumes of the cylinder and the cone are (b) respectively. A.24 cubic decimeter, 24 square decimeter B. 36 cubic decimeter, 12 cubic decimeter C. 12 cubic decimeter, 36 cubic decimeter.

Fourth, measure, fill in, calculate and draw pictures.

1. Measure the length () cm and width () cm of this test paper (keep the whole number of cm).

2. What is the circumference of this test paper?

3. Draw the plan of this test paper with the scale of 1: 10.

5. calculation.

1. Write the number directly.

74×99= 100-298= 25×36=

2. Non-type calculation

0.6+32×0.25-6

3. Column calculation.

(1) 180 is more than 50% of 10. What's this number?

180-50%X= 10，X=340

(2) What is the product of the quotient divided by 0.375 plus 1 1 and multiplied by it?

pig's foot

Six, mathematics in life

1. Our city plans to plant about 840,000 trees this year, and 490,000 trees were planted in the first 35 days. According to this calculation, how many days will it take to complete all the tasks? (Use proportional solution)

84:X=49:35

X=60

Last year, there were 6,000 primary school graduates in our city, 5% more than last year. How many primary school graduates are there this year?

6000× (1+5%) = 6300 (person)

The bookstore has a set of popular science books in 96 yuan at the original price, which are now sold at a 60% discount. How much cheaper can I buy a set? If you buy six sets, will 360 yuan be enough?

96× (1-60%) = 38.4 yuan.

(96-38.4) × 6 = 345.6 (yuan)-Enough.

A cylindrical glassware with a bottom radius of 6 cm contains some water, and a conical plumb hammer with a height of 9 cm is immersed in the water. When the plumb hammer was taken out of the water, the water level dropped by 0.5 cm. How many square centimeters is the bottom area of this cone?

5. A rectangular iron sheet (as shown on the right), 25cm long and15cm wide. Cut a small square with a length of 2cm from the four corners, and then make it into an iron box without a cover. Please help me calculate: how much iron does it take to make such a box? What is the volume of this iron box?

25-4=2 1, 15-4= 1 1,

25× 15-2× 2× 4 = 359 (square centimeter)

2/kloc-0 /×1/kloc-0 /× 2 = 462 (cubic centimeter)

6. Complete the table below and answer the questions. 1) Class () has the best eyesight, and Class () needs health care most. 2) Which class has better myopia than the average? 3) What do you want to say about below-average classes? Talk about your opinions or suggestions. The number of nearsighted people in the class, the percentage of nearsighted people in the class (keep a decimal place before the sign of infinite percentage)

Six 1 Class 40 20% Six 1 Class 8 25% Six 1 Class 45 10 Total