(90 minutes, total score 100)

I. Fill in the blanks (20 points, 65438+ 0 point for each question)

1、×( )=( )÷=( )× 9% = 1

2.33% and 0.304, the largest number is (), and the smallest number is ().

3. The quotient of number A divided by number B is 3.6, so the ratio of number B to number A is (): ().

4. Children's Day party, a class attended 49 people, absent 1 person, and the attendance rate was ().

5. Divide 14 into two prime numbers and the sum is14 = ()+(); Divide 14 into two prime numbers and multiply by 14=( )×).

6.5. The ratio of1:1.7 to the simplest integer is (), and their ratio is ().

7, 1 century = () 3 tons and 5 kilograms a year = () tons.

40.57 square kilometers = () hectares

8.0. 1, 0.25 and the ratio of these four numbers is 2, which is ().

9. Write 1 20908 billion (), and write () billion after omitting1billion.

Second, the judgment question. (Mark "√" in brackets is correct, mark "×" in brackets is wrong, ***5 points)

1, the first term and the last term of the ratio are multiplied by the same natural number, and the ratio remains unchanged. ( )

2. This year, 10 1 sapling was planted on the Arbor Day campus, and all the trees survived, with the survival rate of10/%.

3. Pile a cart of sand into a cone, and the area occupied by the sand pile is inversely proportional to the height. ( )

4, 3: 45 =3.45.( )

This year's output increased by 25% compared with last year, while last year's output decreased by 25% compared with this year. ( )

Three, multiple-choice questions (write the serial number of the correct answer in brackets, ***5 points)

1, the number and amount of subscriptions to China Youth Daily ().

A. directly proportional; Inverse ratio; be disproportionate

2. 100g salt water contains 10g salt, and salt accounts for () of salt water.

A. BC

3. Cut out the largest circle on a rectangular cardboard with a length of 6 cm and a width of 4 cm. The area of this circle is ().

A. 12.56 cm2 B.50.24 cm2 C.28.26 cm2

4. The diameter of the cylinder bottom is 16 cm and the height is 20 cm. Equation 3. 14× 16×20 is used to calculate this cylinder ().

A. Transverse area B. Surface area C. Volume

5. The original price of a commodity in 80 yuan increased by 10%, and then the price was reduced by 10%. The current price is ().

80 yuan 88 yuan 79.2 yuan

Four, calculation (***40 points)

1, oral calculation (10 points)

80-42= 18.2+8= 19-0.2= 1.8×0.4=

24÷0.6= 2 1×= - = 100× 1%=

1.25×8÷ 1.25×8= ×8+8×=

2. Calculation of the following problems can be simplified. (*** 16)

4.05-2.8-0.7 1.25×32×2.5

[ 1-(- )] × 99.9×98+(0.8 - )×999

3. Find the unknown x .(* * 6 points)

= 2X- 102÷6 = 8

4, column calculation (***6 points)

What is the product of (1) 6 divided by 1.5, plus 3 times 3?

(2) The sum of twice the sum of a number is. What's this number? (Equation solving)

5. The area of the right isosceles triangle OAB is 8 square centimeters. Find the area of a circle. (2 points)

V. Answer the following questions (***8 points)

(1) In April, it was rainy and sunny in Wan Li. Please calculate the days of various weather this month and fill in the table below. (***3 points)

weather

destiny

(2) The picture below shows the air quality forecast of some cities in China on April 15, 2003. According to the information and data provided by this statistical chart. Answer the following questions.

Statistical map of air quality in some cities of China

① The picture above is a statistical chart. ( 1)

What questions can be asked from it? What conclusions and suggestions are drawn? (4 points)

Sixth, the application problem. (***22 points)

1, a 3-meter-long steel pipe, cut off, how many meters are left after cutting off the meter?

2. Multimedia classrooms need 1200 square bricks with an area of 36 square decimeters; How many bricks do you need if you replace it with a square brick with an area of 25 square decimeters? (Solve with proportional knowledge)

3. Two cars, A and B, travel from A to B at the same time. Car A needs 65,438+00 hours, and car B needs 65,438+05 hours. When car A arrives at place B, it will return immediately and meet car B at 72 kilometers away from place B. What is the distance between place A and place B?

4, a barrel of gasoline, first use 20% of the total, and then use the rest, then there are 60 kilograms left in the gasoline barrel. How many kilograms does this barrel of gasoline weigh?