0.8×0.6× 1.25

3. 14×7.2+3. 14×3.8-3. 14

Please ask a math question before you answer.

Key and difficult points, catch them all.

A classroom is 6.5 meters wide and 2.5 times long. What is the area of this classroom? (Numbers are reserved as integers. )

The school bought five basketballs and eight volleyballs. Basketball is 42.6 yuan and volleyball is 28.8 yuan. How much does the school have to pay?

7. A car travels from A to B at a speed of 64 kilometers per hour and arrives at B in 4.5 hours. If the speed is 75 kilometers per hour, can it be reached in 3.8 hours?

8. The product of two factors is 24.4, in which one factor is enlarged by 6 times and the other factor is reduced by 2 times. What is the product?

By analogy, we can apply innovation to show our talents!

9. Calculate the following questions in a simple way.

1 1×22+0.22×3300+660×2.2

10. A decimal is multiplied by itself, and the product and difference add up to 0.36. What is this decimal?

Organization and review

1.( 1) beam (2) 20.25× 8 (3) 6.5× (2.4+7.6)

(4)( 12.5×0.8)×3.4 (5)9.95 10.0 10 (6)2 9

2.( 1)B (2)B (3)C (4)B

3.99 1000 0.6 3 1.4

leave out

5.6.5×2.5×6.5≈ 106 (m2)

6.443 4 yuan 7. number

8.73.2

9. The original formula =11× 22+22× 33+66× 22.

=( 1 1+33+66)×22

= 1 10×22

=2420

10.0.6

The first volume of the fifth grade of primary school Unit 1 Mathematics Examination Paper 2

1. Fill in the following figures on the corresponding lines.

19 28 75 5 1 18

342 47 60 25 45

62 27 90 120 30

Multiply of 2:

Multiply of 3:

Multiple of 5:

At the same time is a multiple of 2, 3:

At the same time is a multiple of 3.5:

Multiples of 2, 3 and 5 at the same time:

2. Answer the questions according to the table below.

(1) Mark all odd numbers, even numbers and prime numbers with different symbols.

(2) Please select any two composite numbers in the table and write down all their factors.

(3) Please calculate the product of any two prime numbers. What did you find through calculation?

Please judge.

(1) prime numbers have only two factors. ( )

(2) The factor of a number is less than the multiple of this number. ( )

(3) The sum of two prime numbers must be even. ( )

(4) 1 is a factor of any natural number (except 0). ( )

Comprehensive promotion

Key and difficult points, catch them all.

4. Guess who I am?

5. Fill in the appropriate minimum figure ☆ below to make all figures meet the requirements.

(1) is a multiple of 3.

5☆6 2☆9 3 1☆6

(2) Both have a factor of 4.

14☆ 2☆8 ☆04

(3) divisible by 2, 3 and 5 at the same time.

54☆ 4☆0 1☆40

When the students went camping, Mr. Wang bought a box of mineral water, three bottles of land, four bottles of land, five bottles of land and five bottles of land, all of which were just counted, and there was no surplus. How many bottles of mineral water are there in this box at least?

Exploratory exploration

Only by applying innovation can we give full play to our talents.

7. Please write down the prime numbers that meet the following conditions.

8. Teacher Li is 20 12 years old and in his forties. His date of birth is EF month GH in ABCD year.

C: There are two factors and three factors.

D: It is a prime number within 10.

E: Non-zero natural numbers are neither prime nor composite.

F: It is both a prime number and an even number.

G: the smallest natural number.

H: It's weird and complicated. m

Unit 1 Organization and Review

1.28, 18,342,60,62,90, 120,30

75,5 1, 18,342,60,45,27,90, 120,30

75,60,25,45,90, 120,30

18,60,90, 120,30

75,60,45,90, 120, 30 60,90, 120,30.

2.( 1) Odd number: 1 3 5 7 …29 Even number: 2 4 6 8 … 30 Prime number: 2357113192329 (2) 4. 5438+0236 (3) 2× 5 =103× 7 = 21,and the product of any two prime numbers is a composite number.

3.( 1)√ (2)× (3)× (4)√

4.7240

5.( 1) 1 1 2

(2)0 0 1

(3)0 2 1

6.60 Tip: List partial multiples of 3, 4 and 5 respectively, then find their common multiples, and then find the smallest number.

7. 19

8. 1967 19 February

The first volume of the fifth grade in primary school Unit 1 Math Test Paper 3

First, think carefully and fill in carefully. 22 points

1, expanding 0.59 to its 10 times is (), and reducing 5.9 to it is ().

2. Fill in the appropriate figures according to 32× 18 = 576.

3.2× 18=( ) 0.32×0. 18=( )

( )× 18=0.576 ( )×( )=5.76

3.8.279 Keep one place after the decimal point, which is about (), and the accuracy is about ().

4. Fill in "","or" = "in the box below.

3.5×0.99○3.5 7. 1×0.54○7. 1×5.4 4.25× 1. 1○4.25

0.83×3.02○3.02

5、6.9×4.5+3. 1×4.5=(____+____)×4.5

0.25×7.8×4=7.8×(___×____)

6. The product of two numbers is 6.4. If one factor is expanded to 10 and the other factor is expanded to 100, the product becomes ().

7,65.4 is 3.2 times that of (), and 1.6 is ()

Half of 8.6 is (), and three tenths of 72 is ().

8. Two-digit numbers. Rounding to the tenth place is about 3.6. This number is (), and the minimum value is ().

Second, compare repeatedly and choose carefully. 10 point

The simple algorithm of 1 and 16×9.8 is ().

a . 16× 10- 16×2 b . 16×( 10-2)c . 16×( 10-0.2)

2. When a number is expanded to its 100 times, it is 50, and this number is ().

0.5 to 0.05

3. The result of () is greater than the first factor.

A.5.4×0.9 B. 0.32×2 C.0.65×0

4, 8.5 hours is 8 hours () minutes.

a5 b . 50 c . 30

5. If □×χ = 5.4, (□× 2 )× (2) = ().

2 1.6 C. 10.8

Third, judge the question. 6 points

() 1, the product of two decimals must be a decimal.

() 2.65438+ 0.2 times the number greater than 0 must be greater than this number.

The product of () 3, 8.6×0.7, with one decimal place reserved, is about 6.0.

() 4. The product of 1.25× 0.97 is greater than 0.97 and less than1.25.

( )5、8.4- 1.4×0.2=7×0.2= 1.4。

( )6、 17.4×9+ 17.4= 17.4× 10= 174

Fourth, careful calculation and careful investigation. 34 points

1, a number written directly. 6 points

0.8×0.5= 0.9×5= 8×0.06= 0.05× 1.6=

0.75+0.4= 4.3+5.7= 0.27-0.2= 1.2-0.9=

100×0.7= 2.5×8= 1.06×7= 0.0 1×7.2=

2. Calculate the following questions in a simple way. 18 point

2.3×2.5×0.4 0.29× 102 1.2×2.5+0.8×2.5

1.25×0.4×8×2.5 0. 125×72 0.25×39+0.25

3, column vertical calculation. 10 point

☆0.43×27= 8.3×0. 15≈

(Keep two decimal places)

30.9×2.4= 1.85×2.6=

Fifth, apply knowledge to solve problems. 28 points

1, boys generally have 0.077 kg of blood per kg of weight, and Xiaoming weighs 34 kg. How many kilograms of blood does he contain in his body? (Figures shall be kept to two decimal places)

2. The height of sika deer is 1.46m, and the height of giraffe is 3.5 times that of sika deer.

(1) How tall is this giraffe?

(2) How many meters is sika deer shorter than giraffe?

3. The average speed of the train is about 70km/h, which is about 9.5km more than that of the car. It takes 6.4 hours for a car to travel from A to B. How many kilometers is there between A and B?

In April and September, how many kilowatt-hours can users in this building save?

(After switching to energy-saving lamps, each household can save electricity 1.28 degrees per day. There are 30 families in this building. )

5、

Articles gloves scarves hats

Unit price 5.8 yuan/Double 10.2 yuan/Set of 8.4 yuan/Top.

(1) How much does it cost mom to buy 5 gloves and 2 scarves? ;

(2) Dad brought 26 yuan money and wanted to buy one of these three things. Is there enough money?

6. Parking in the parking lot 1 time must be paid to 6 yuan at least. Parking for more than 3 hours, every 1 hour parking will be overpaid to 2.5 yuan. A car has been parked for 6.5 hours. How much should I pay when I leave? (Less than 1 hour is calculated as 1 hour)

Expanding and upgrading questions: (plus 10)

The school organized teachers and students to watch movies, with 950 students and 27 teachers. 8 yuan, an adult, and 4 yuan, a student. More than 30 people can buy group tickets, group tickets to 6 yuan. Please design the most economical ticket purchase scheme. How much will it cost at least? (There must be a calculation process)