Fill in the blanks. (20 points)
1, 760.30028 writing (), rounded to the "billion" position is about () billion.
2, 2.3 hours = () hours () minutes, 0.75 cubic meters = () liters.
3, A =2×3×5, B =2×2×3, then the greatest common divisor of A and B is (), and the smallest common multiple is ().
4. A map with a length of 5cm, indicating that the actual distance is 20km. The scale of this map is (). If the actual distance between the two places is 126km, then () cm should be drawn on this map.
5. In the sixth grade, the number of boys in one class accounts for the whole class, so girls account for ()% of the number of boys.
6. Divide a 3-meter-long iron wire into 5 segments on average, each segment is () meters long and each segment is () long.
The following topic is different from the above one.
Fill in the blanks
1, 2065 10000 is () in "ten thousand", rounded to "one hundred million".
2. The smallest number that can be divisible by 15 and 18 at the same time is (), which is called () of these two numbers.
3. For triangles and parallelograms with equal bases and equal heights, the area of triangles is 25m2, so the area of parallelograms is ().
4.A number is 25% of B number, and B number is () of A number.
5. The largest six-digit number consisting of three "0s" and three "6s" is (), which is pronounced as ().
Numbers that read only one zero are () and ().
6, a fraction, the numerator is smaller than the denominator 18, after the divisor. It turns out that this score is ().
7. There were * * () days in the first quarter of 2008 and * * () days in 2 100.
8、0.875=( ):40= =2 1÷( )=( )%
9, three consecutive even numbers, the middle number is m, then the two adjacent numbers are () and () respectively.
10. In a proportion, two internal terms are reciprocal, one is the smallest prime number and the other is ().
1 1, A× 3 = B×, then A: B = (): (), if 4x = Y, then the relationship between x and y is ().
12,, 33.3%, 0. ">" connection,, is ().
Second, the judgment question.
1 and coprime may not be prime numbers. ( )
2. The approximation of two numbers must be less than either of them. ( )
3. If A is divisible by B, then A is a multiple and B is a divisor. ( )
The price of a commodity will increase by 20% first, then decrease by 20%, and the price will remain unchanged. ( )
5. An angle less than180 is called an obtuse angle. ( )
6. The false score is greater than 1. ( )
7. If A is greater than B and B is less than A .. ()
8. The radius of a circle is half its diameter. ( )
9. Axisymmetric graphics are folded in half along any straight line, and the two parts can overlap. ( )
Third, multiple choice questions
1, a fractional molecule is enlarged by 6 times, and the denominator () and fractional value will decrease.
A, expand 8 times b, shrink 8 times c, shrink d, expand.
The prime factor of 2, 50 decomposition can be written as ()
a、50= 1×2×5×5 B、2×5×5 = 50°C、50=2×5×5 D、50=2×25
3. A gear with a diameter of 48cm drives a gear with a diameter of 26cm (meshing with each other). If the big gear turns 12 turn, the small gear turns () turn.
a、24 B、 16 C、 12 D、9、
4. The simplest fraction with denominator of 9 is ().
a、8 B、6 C、9
The highest rank of the quotient of 5.7.56 ÷ 0.85 is ().
A, unit B, tenth C, tenth D, percentile
Fourth, the calculation problem
1, the number is written directly.
0.5÷0.0 1= 42× 10%= 2.9+7. 1=
0÷ 1 = × + = 1-0.025÷ =
1- -0.25= 100 1×99-99= 1.25× 1.5×8=
2. Off-mold calculation can be simplified.
×〔 ÷( - )〕 3 ×3 +3.4×6.625
1 ×7.3×5 + 1 ×7.3×2
2005× 2004 ÷4
3. find the unknown X.
= (4-x)×2=8
0.4x+3×0.4=30× : =:
4, column calculation
& lt 1 & gt； How much is the 5 in 120 more than that in 120?
& lt2> The sum of a number is 1 less than the maximum two digits. What's this number?
5. Look at the statistics to answer the following questions. The following table is the statistics of students of all grades in a school in 2007.
First, second, third, fourth, fifth and sixth grades.
Number of people: 200 205 245160174178
& lt 1 & gt； Make a bar chart
& lt2> What percentage of the total number of students in the fifth grade accounts for the whole school?
& lt3> What percentage is the most populous grade more than the least populous grade?
& lt4> What is the average score of the whole school?
& lt5> Look at the picture and find the degree of ∠ 1 ∠2.
1, the radius of the circle is equal to the radius of the sector. It is known that the area of a circle is 30 square centimeters and the central angle of a sector is 36o. Find the area of the sector.
2. For a project, Party A will do it for 2 days and Party B will do it for 3 days. If the whole project is completed, Party A will do it for 3 days. If the rest of the projects are completed, Party B will do it last. How many days does it take Party B to finish this work?
A motorcade carrying a batch of relief materials was originally planned to travel at a speed of 40 kilometers per hour and arrive at the disaster area after 7.5 hours. Actually, it is 10 km per hour, so how many hours did it take to reach the disaster area?
4. Make a cylindrical water tank without a cover with iron sheet. The bottom is 20 cm in diameter and 24 cm in height. How many square decimetres of iron do you need to make this water tank? What is the volume of this water tank?
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