The first volume of the fifth grade mathematics is easy to make mistakes and practice application problems.
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1, the three sides of a right triangle are 3 cm, 4 cm and 5 cm respectively, and the area of this triangle is (). The height on the hypotenuse is () cm.
2. Two () triangles can be combined into a parallelogram, and two () triangles can be combined into a rectangle.
3.0. 15 hours = () minutes 138 minutes = () hours.
1: 42 = (): 2.4 = (): ()
20500 square meters = () hectares 4.05 hectares = () square meters
4 square meters = 4 square decimeters () square meters
4, rectangular wooden frame, drawn as a parallelogram, () unchanged, () smaller. Parallelogram wooden frame, drawn as a rectangle, with area () and perimeter ().
5. After rounding, three decimal places are 2.56. The maximum possible number of decimal places is (), and the minimum possible number of decimal places is ().
6. The equilateral triangle is the area of equilateral parallelogram (). The area of triangle and parallelogram is equal to the base, so the base of triangle is the base of parallelogram (). If the base of a triangle is 10cm, the base of a parallelogram is ().
7, 1.373737 ... is a decimal (), and its cycle segment is (), which is written as () in a simple way. This number has two decimal places (). The loop part of 2.235235 ... is ()
8. The product of1.205× 0.35 has () decimal places.
14.7 has () 0.7.
9. 13.65 is extended to the original number () is1365;
6.8 Reducing () to the original number is 0.068.
10, a number multiplied by a number greater than 1, the product ratio of this number (); Multiply a number by a number less than 1, and the product ratio is this number (). A number divided by a number greater than 1, the quotient ratio of this number (); Divide a number by a number less than 1 (except 0), and the quotient ratio is this number ().
2.6×0.78○2.6 0.24×360○3.6×24
17.3÷ 1. 1○ 17.3 5.08÷0.22○5.08
3.8÷0.8○3.8 3.8×0.7○38×0.07
0.42○0.4×2 2.6÷ 1.4○2.6× 1.4
1 1, find the dividend.
Li Shifu makes 20 parts in 4 hours, with an average of () parts per hour; It takes () hours to make each part.
50 kilograms of soybeans can squeeze 25 kilograms of soybean milk, and each kilogram of soybeans can squeeze () kilograms of soybean milk. Squeezing 1 kg soybean milk requires () kg soybean milk.
12、 19.76÷0.26=( )÷26=( )。
0.69×( )=( )×54 = 6.9×0.54
13, the area of parallelogram is 10dm2, and the area of equilateral triangle is ().
14, trapezoidal area formula is expressed in letters as ().
The law of multiplication and distribution is expressed in letters as ().
15. After the decimal point of a number is moved 2 places to the right, it is greater than the original number 1237.5, and this number is ().
16, the garment factory has to process a batch of children's clothes. It turns out that each time you use 1.5 meters of cloth, you can process 480 sets. Now each set uses 0.3 m less cloth, and now it can be processed ().
17、3.6× 1.9+0.36×8 1=3.6×( 1.9+ )
18, arranged in descending order of 0.607, 0.607, 0.607, 0.607 and 0.607.
19, () with unknowns is called an equation.
20. It takes 3.6 minutes to saw a piece of wood into 3 sections and () minutes to saw it into 8 sections.
2 1, a shirt needs 6 buttons, 100 buttons can nail () shirts at most.
22. Calculate 1.68÷0. 15. When the quotient is 1 1, the remainder is ().
23. A parallelogram with a base of 18cm and a height of 1 1cm, which is nailed by four pieces of wood. After drawing into a rectangle, the area increased by 36cm? . The width of the rectangle is () cm.
24. A construction site uses cars to transport soil, and each car transports X tons. Six cars were delivered in the morning and five cars were delivered in the afternoon. On this day, tons of soil were transported, and more soil was transported in the morning than in the afternoon.
Tons.
25. The mall sold 10 TV sets in the morning, and sold 7 TV sets in the afternoon at one yuan each. Sell TV sets for one yuan all day, and sell TV sets less in the morning than in the afternoon.
26. The gymnasium is divided into upper, middle and lower floors, with upper 10 rows, with one seat in each row; Middle floor 13 rows, each row has Block B; Lower floor 16 rows, each row of block C. There is a seat in this gymnasium.
27. The sum of three consecutive natural numbers is 60, and these three numbers are (), () and () respectively.
28, 12.5× ()-6.5× () = 4.2 (the same number in brackets)
29. The area of parallelogram is 84dm? The base of a triangle with equal base and equal height is 6dm, and the height is ().
Mileage charging standard
Within 3km 10 yuan
For every increase of 1 km over 3 km,
Take it back to 2.5 yuan.
30. Taxi charges are shown in the table on the right:
Xiaoying walked 9 kilometers by taxi.
Pay at least () yuan.
Second, solve practical problems.
1. A classroom is13m long and 8.4m wide. The floor is paved with square bricks, covering an area of 0.09 square meters. How many square bricks do you need?
2. It took 16.5 yuan to buy three pens. How much should it cost to buy the same five pens?
Class 3.4 1 bought two ropes 10m long to jump rope. A rope is 1.4m long. How many can you make at most?
4. 24 bags of milk per box, ***40.8 yuan; 22 bags of B milk per box, ***35.2 yuan, which is cheaper? How much is a pack cheaper?
A chicken farm has to transport 322kg eggs. If each wooden box can hold 15kg of eggs at most, how many such wooden boxes do you need?
6. In the 30 years of reform and opening up, China's financial expenditure on education increased from 7.505 billion yuan in 1978 to 71223.2 billion yuan in 2007. How many times has it increased? (Numbers are reserved as integers)
7. parallelogram wheat field, with a base height of 2 15m and a height of 17m. How big is this wheat field? How many kilograms of wheat are harvested on average per square meter?
8. Planting sunflowers in a parallelogram field with a bottom length of 90m and a height of 60m, if each sunflower covers an average area of 0.25m? How many sunflowers can this land grow?
9. The perimeter of the parallelogram iron sheet is 82cm, the length of a base is 16cm, and the height of this base is 20cm. What is the height of the other base?
10、
1 1. The base of the triangle is 16 decimeter, which is 4 decimeters longer than the height. What is the area of this triangle?
12, a triangular wheat field, bottom 26 meters, height 13 meters, * * * 507 kg of wheat, how many kg of wheat per square meter on average?
13. A triangular billboard with a base of 2.8m and a height of1.8m.. If you need 0.48 kg of paint per square meter, how many kg of paint do you need to paint the front of this billboard? (Numbers are reserved as integers)
14. The shadow area on the right is 10 cm2.
How many square centimeters is the area of triangle ABC?
15, two right angles of a right triangle are 3cm and 4cm respectively, the hypotenuse is 5cm, and the height on the hypotenuse is.
How many centimeters?
16, the area of the shaded part in the right trapezoid.
Is it 13.5cm? What is the area of this trapezoid?
17, a trapezoidal wheat field with an upper bottom of 35 meters and a lower bottom of 25 meters, with an area of 1 140 square meters and a height of how many meters?
18, a trapezoidal steel plate, with an upper bottom of 45 cm, a height of 28 cm, an area of 980 cm 2, and a lower bottom of how many cm?
19, as shown on the right, the area of the trapezoid is 90cm? ,
Upper bottom 10cm, lower bottom 20cm. Qiuyin.
The area of the shaded part.
20. Car A travels from place A to place B for 3.2 hours, with an average speed of 95 kilometers per hour; It took 3.8 hours to get from B to A, and how many kilometers per hour did you travel on average?
2 1, the school bought 700 books and planned to put them back in cartons. It is known that each container can hold at most 1 10 copies. How many cartons do you need to prepare?
22. This clothing factory makes a man's coat out of 2.5 meters of cloth. Now there are 42 meters of cloth. How many such men's coats can it make?
23. Grandma needs 0.85 meters of silk rope to knit a Chinese knot. Now there is 30 meters of silk rope. How many Chinese knots can she knit at most?
How many kilograms of soybean milk can be squeezed from 24.50 kilograms of soybeans and 120 kilograms of soybeans?
25. A car will drive from City A to City B at a certain speed, and it will take five hours to arrive. 3.5 hours after the bus leaves from City A, it is still 90 kilometers to City B. How many kilometers is it from City A to City B?
26. A rectangular food bag is 0.3 meters long and 0.2 meters wide. How many square meters of cloth do you need to make these 450 food bags?
27. Mom and Dad took Lan Lan (the height of Lan Lan is1.3m) to visit the Great Wall. One-way fare 12.4 yuan/person,1children under 0.4m are half price. Dad bought a round-trip ticket for three people. He paid the conductor 100 yuan. How much should he get back?
28. Uncle Li handed in 12.5 yuan in the parking lot. How many hours did he park in this parking lot?
29. In the sports meeting for the elderly, Liu took part in the long-distance race, covering a distance of 1.5 km and taking 9.7 minutes, and won the first place. Li spends 2 minutes more than Liu. How many minutes does Li Run 1 km take on average?
30. Xiaoming buys 3kg pears and 3kg apples * * and pays 20. 1 yuan, while Xiao Fang buys 1kg pears and 3kg apples * * and pays 15. 1 yuan. How much are apples and pears per kilogram?
3 1, Xiaojun's car consumes 7 liters when driving 90 kilometers, and the bright car drives 1 1 liter. Whose car has low fuel consumption? (The number shall be kept to one decimal place)
Third, solve application problems with column equations.
1. The school bought 10 boxes of chalk. 250 boxes have been used, and there are 550 boxes left. How many cases are there in each case on average?
There are 200 students in grade four. During extracurricular activities, 80 girls went to jump rope. The boys are divided into five groups to play football. How many people are in each group?
3. The canteen sent 150 kg of rice, which was 30 kg less than the flour. How many kilograms of flour does the canteen send?
There are 52 peach trees and 6 rows of pear trees in the orchard, and there are 20 more pear trees than peach trees. How many pear trees are there in each row on average?
5. The area of a triangular land is 840 square meters, the bottom is 140 meters, and the height is how many meters?
6. Li Shifu bought 72 meters of cloth just to make 20 adult clothes and 16 children's clothes. Adult dresses are 2.4 meters each, and how many meters are children's dresses?
Seven or three years ago, my mother was six times older than my daughter. This year, my mother is 33 years old. How old is my daughter?
8. How long will it take for a car with a speed of 50 kilometers per hour to catch up with a car with a speed of 40 kilometers per hour that left two hours ago?
In 2004, the population of Asia was about 3.9 billion, 400 million more than the total population of Europe. What's the population of Europe?
10, the school bought 40 pens and 20 basketballs for one use.
1 180 yuan. How much is a basketball?
11.In the 2004 Athens Olympic Games, China won 32 gold medals, three less than the seven in the 1998 Seoul Olympic Games. How many gold medals did China win?
12. In a cage, there are chickens and rabbits. There are six heads, 20 feet. How many chickens and rabbits are there in the cage?
13. The life span of an elephant is 80 years, and the life span of a tortoise is twice that of an elephant in 20 years. How many years can a turtle live?
Xiao Li and Lan Lan play skipping rope. Xiao Li jumps four times as fast as Lan Lan, and Lan Lan jumps 39 times as fast as Xiao Li. How many dances did Xiao Li and Lan Lan dance?
15, Xiao Qiang bought 24 2 yuan 80-point stamps and used 30 yuan. How many stamps did you buy each?
16. Qiang Qiang and Lily have 40 pieces of toffee. Qiang Qiang's toffee is 6 yuan less than Lily's. How many toffee does Qiang Qiang have?
There are 138 female athletes in the 28th Olympic Games in China, and there are 8 female athletes, twice as many as male athletes. How many male and female athletes are there?
17, a double-decker bus * * * carries 54 passengers, and the number of passengers on the upper floor is twice that on the lower floor. How many passengers are there in the upper and lower floors respectively?
18. It is known that the width of a rectangle is half the length and the circumference is 3.6 meters. What is the width of this rectangle? What is the area?
19. To build an expressway, it is planned to build 1.2km every day, which is 0.2km less than the actual situation. It was finished five days in advance. How many kilometers is this road?
20. Xiaoming and Xiaogang collected some glass balls. Xiaoming's glass ball is three times as big as Xiaogang's. If Xiao Ming gives Xiao Gang six, there will be as many as two people. How many glass balls do they have?
2 1. Mom bought a box of navel oranges. According to the planned number of days, if she eats four navel oranges every day, she will get 48 more navel oranges. Eat six oranges a day and you will lose eight navel oranges. How many days are you going to eat? How many navel oranges are there in this box?
22. There are two barrels of oil. The original weight of barrel A is 10 kg. After pouring out 1.2 kg, it is 2.8 kg less than that of barrel B. How much kg does barrel B weigh?
23. My mother is 38 years old and my son 10 years old. A few years ago, my mother was five times older than my son.
24. Grandpa is 69 years old, four years older than Xiaoming. How old is Xiaoming this year?
25. There are the same green balls and yellow balls in the box. Take out six green balls and four yellow balls at a time. After several visits, there were 36 more yellow balls than green balls in the box. How many times have you taken it?