fill (up) a vacancy

1, the largest number in billions, the smallest composite number in tens of millions, the smallest prime number in thousands, and the rest are 0. This number is (), rounded to hundreds of millions, and recorded as () billion.

2.6: The ratio of1.8 to the simplest integer is (), and the ratio is ().

3, 3 hours = () minutes 8.06 cubic meters = () liters.

4. A pile of 6 tons of chemical fertilizer is distributed to three production teams of A, B and Inner Mongolia according to the ratio of 1:3:4. Team A gets (-) tons of fertilizer, and team B gets (-) tons.

The distance between Party A and Party B is 35km, and the length drawn on the map is 7cm. The scale of this map is ().

The least common multiple of 6, 24 and 54 is (), and the greatest common divisor is ().

7. The sixth grade students carried out tree planting activities, 80 trees survived and 5 trees did not survive. The survival rate is the highest ().

8. The length of the rope is equal to its own length plus meters. This rope is () meters long.

9. The sum of the sides of a cube is 48 cm, its surface area is () square cm, and its volume is () cubic cm.

10, a job, Party A can complete it in two days alone. According to this calculation, the remaining work will take () days to complete.

1 1. If the height of the cylinder is shortened by 3cm, the surface area will be reduced by 94.2cm2. Its bottom radius is () cm, and its volume will be reduced by () cm3.

Second, judgment.

1, a symmetric graph with two parallelograms. ( )

2. If x × = y×, then x: y =: ()

3.A number can be divisible by B number, and B number must be the greatest common divisor of A number and B number. ( )

4. The working hours are fixed, and the time for manufacturing each part is directly proportional to the number of parts. ( )

Third, choose. (Fill in the serial number of the correct answer in brackets) (3 points)

1 and 3.496 keep two decimal places, which is about ().

①3.49 ②4.00 ③3.50

2. Typing a manuscript takes Party A 5 minutes and Party B 8 minutes. The simplest ratio of work efficiency between Party A and Party B is ().

①5:8 ②8:5

Fourth, calculation

1, the number is written directly.

5.4+8=

9-2 =

9÷ 3 × 18=

3.75+ 1 =

2 ÷4=

9.625- 1.375 =

1 × 1.5=

( 1-0.2÷ 1 )÷ 0.5

2. Solve the equation.

① 12 -4x=2

②38:x=4.75: 1

③ x+ x= 1.4

3. Calculate with recursive equation.

①308× 16- 14874÷37

②(3 + -2 )× 1

③3.5÷0.8×2.7+7.3÷ 1

(4)9.8÷[28×( 1- )+5 ]

4. Column calculation.

(1) A number plus 2.8 equals 12.8. Find this number.

② What is the sum of12% plus 1.25 divided by 80?

5. The following is a statistical chart of the number of boys and girls in the sixth grade of Hongqi Primary School. ( 1+2+2=5)

Six, application questions

1, a truck and a bus leave from two places 504 kilometers apart at the same time and meet after 4.5 hours. The bus travels 64 kilometers per hour, and how many kilometers does the truck travel per hour?

A washing machine factory plans to produce 504 washing machines in May. In fact, it was completed 5/9 in the first half of the year and 2/3 in the second half. How many washing machines did it actually produce this month?

3. Party A completes a project in 8 days, and Party B 12 days ... Now after three days, Party A will do the rest alone. How many days will it take to complete?

There are 40 more peach trees than apricot trees in the orchard, and the number of apricot trees is 80% of peach trees. How many peach trees are there?

5. Conical sand pile with a bottom area of 3.6 square meters and a height of 1.2 meters. How high can you put this pile of sand in a bunker 2 meters long 1.5 meters wide?

6. The ratio of male to female students who participated in the math contest in a school was 6:5, and then five girls were added. At this time, the number of girls is 8/9 of the number of boys. How many girls took part in the math contest?