The answer to the fifth grade sprint 100.

Final examination paper of fifth grade mathematics in primary school

School Name Results 2004, 12

I. Fill in the blanks: (20%)

The product of 1 and 4.5×0.9 is (), and one decimal place is ().

2. The decimal representation of the business cycle of11÷ 6 is (), and the number of decimal places is ().

3.36000 square meters = () hectares 5.402 kilograms = () kilograms () grams.

2 km 7 m = () km () hours =2 hours and 45 minutes

4. fill in ">", "

0.78÷0.99○0.78 7.8× 1.3○7.8 9.027× 100○9.027÷0.0 1

5. According to "a steel wire weighing 0.25m and 0.2kg", () can be obtained, and the formula is (); You can also find (), and the formula is ().

6. The circumference of a rectangle is 36 meters, the known length is three times the width, and the area of this rectangle is ().

7. Xiao Lin's average stride is 0.7 meters. He walked 820 steps from home to school, which is () meters away from home.

8. Move the decimal point of a decimal to the right by two places to get a new number. The difference between this new number and the original number is 44.55, and the original number is ().

9. The three sides of a right triangle are 6 cm, 8 cm and 10 cm respectively. The area of this triangle is () square centimeters, and the height on the hypotenuse is () centimeters.

Second, judgment: (5%)

1, 9.996 The two decimal places reserved are 10. ……………………………………………………( )

The result of 2.0.25×0.4÷0.25×0.4 is 1. ………………………………………………( )

3. The dividend is constant, the divisor is reduced by 10 times, and the quotient is also reduced by 10 times. ……………………………………( )

4、a÷0. 1=a× 10 …………

5. The number A is a, which is four times less than the number B, and the formula for finding the number B is 4a-b .............................................. ().

Three. Choice: (5%)

1 has () two digits, greater than 0. 1 less than 0.2.

A, 9 B, 0 C, countless d, 99

2. Two decimal places are accurate to 5.0, and the minimum number of digits is ().

a、4.99 B、5. 1 C、4.94 D、4.95

3. The life span of epiphyllum can last at least 4 hours, and the flowering time of wheat is 0.02 times that of epiphyllum, which is about ().

A, 0.8 minutes b, 5 minutes c, 0.08 minutes d, 4 minutes.

4.A ÷ B = C...7. If both A and B are reduced by 10 times, the remainder is ().

a、70 B、7 C、0.7 D、0.07

5. Simply calculate 6.4× 10 1-6.4, and you will use ().

A, multiplicative commutative law b, multiplicative distributive law c, multiplicative associative law d, additive associative law

Fourth, calculation:

1, oral calculation: (5%)

0.4×0.02= 3.5+7.6= 1.23÷3= 2.4×2.5= 16÷ 1.6=

0.9÷0.0 1= 7÷0.25= 99×0.25= 1.2×0.4+0.4× 1.3= 4×( 1.5+0.25) =

2. Recursive equation calculation: (If it can be calculated by simple method, it can be calculated by simple method) (10%)

0. 1 1× 1.8+8.2×0. 1 1 0.8×(3.2-2.99÷2.3) 3.5-3.5×0.98

12.5×2.5×3.2 (8. 1-5.4)÷3.6+85.7

3. Solving equation: (7%)

2 x ÷ 2.3 = 4.56 5 x-2+1.8 = 3.67 (x-1.2) = 2.1(test)

Verb (abbreviation of verb) Look at the picture and answer the question: (5%)

Statistics of Love Donation in Grade 5 and 6 of Nanchang Street Primary School.

1 and () donated the most.

2. The average donation per class in grade five is () yuan.

There are 23 classes in Nanchang Street Primary School. Please estimate that the donation of the whole school is about () yuan.

Please ask a math question and answer it.

6. Formula calculation: (5%)

What is the product of 1, 1? 6 times 0.5 divided by 1? 2. Twice a number minus the product of 2.6 and 4,

The difference is 10. Find this number.

VII. Practical Problems: (6%)

Songshan primary school went to Heping stationery store and bought 100 Chinese books, each of which was 0.80 yuan; 150 math book; 0.50 yuan each, 80 ballpoint pens, 2.50 yuan each; Glue 120 bottles, each bottle 1.45 yuan.

1. Please make an invoice below.

Heping stationery store invoice

Purchase unit: year month day.

Title of article

amount

unit

Unit price (yuan)

Jin 'e

one hundred

ten

Yuan dynasty (1206- 1368)

corner

minute

Total amount: RMB (in words): one hundred and ten cents.

2. How much should 550 yuan, the shopkeeper, get back? (Column Solution)

Eight, solve the problem: (32%)

1. The distance between Party A and Party B is 740m. Two trains leave from two places at the same time. After a five-hour meeting, car A was driving at a speed of 72 kilometers per hour. How many kilometers does B train run per hour?

2. The children brought 10 yuan to buy stationery, pencils 1.2 yuan, exercise book 0.7 yuan and colored paper 0.2 yuan. The children bought five pencils, and the rest of the money was used to buy colored paper, and they could also buy some colored paper?

3. The following are some situations in which two classes in Grade Five participated in tree planting activities:

Project category

Category 5 (1)

Class 5 (2)

Number of people involved in planting (person)

Number of trees planted per capita (trees)

four

five

(1) How many trees are planted in each class? (2) How many trees will each person plant?

There are 480 peach and pear trees in the orchard. There are three times as many pear trees as peach trees. How many peach and pear trees are there in the orchard? (Equation solving)

5. Li's living room is 6 meters long and 4.8 meters wide. It is planned to lay square bricks on the ground. The square bricks in the shop have the following dimensions: ① side length 10 cm. ② The side length is 35cm. ③ The side length is 40 cm. ④ The side length is 50 cm. Would you please help Li Wei choose one of the square bricks, explain the reasons for the choice, and calculate how many such square bricks you need to buy?