The second grade of primary school

The second grade of primary school

The second grade of primary school_ Baidu Wenku
It is a good exercise for the second grade students. 2 pages browse: 1732 times
wenku.baidu.com/view/7c91a901de80d4d8d15a ...2011-7-6
Second grade primary school mathematics volume II mental arithmetic problems.pdf 2 pages browse: 6808 times
Primary school mathematics volume 2 oral arithmetic problems.doc 7 pages browse: 2754 times
2010-2011 school year primary school sophomore Volume II mathematics oral arithmetic special exercise questions.doc 2 pages browse: 415 times
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Elementary school mathematics volume 2 oral arithmetic
Time: 3 minutes
24÷4= 7＋63= 9×4= 36÷6= 9×7=
56÷8= 28＋6= 7×5= 36＋4= 30÷5=
63÷9= 64÷8= 38＋16= 45÷5= 7÷1=
25＋23= 12＋35= 27＋71= 46＋33= 40÷8=
21＋15= 36＋22= 59＋18= 72＋24= 41－29=
44－9= 72＋16= 43＋32= 35－8= 56÷7=
8×2= 7＋56= 56÷7= 12÷6= 4×2=
21－7= 7×3= 8÷8= 32÷4= 80－9=
( )×6=30 42÷7= 35－6= 28÷7= ( )×8=48
21÷3= 36÷4= 18÷2= 63÷7= 9×6=
9×9= 46＋10= 65＋40= 81÷9= 55－20=
9＋46= 9÷3= 9÷9= 58＋32= 80－28=
33＋60= 54÷6= 40÷8= （ ）×4=20 61－13=
15÷5= 9×3= 42－15= 18÷9= 180－60=
72－40= 47＋8= 14＋85= 61＋27= 170＋20=
5×9= 7×7= 73＋16= 60＋300= 10÷5=
83－29= 5×6= 43－17= 21＋27= 32÷8=
30÷6= 36÷4= 64÷8= 5÷1= 15÷3=
16÷8= 42÷6= 400＋50= 38＋26= 93－8=
49÷7= 6×9= 56－30= 35÷5= 27＋25=

I need the fifth grade math (Volume I) oral arithmetic, to take off the formula calculation

Music book for grade 4 of primary school published by Jiangsu Education Press

Are there any practical problems in Volume 2 of grade 4 of Jiangsu Education Press?
Jiangsu Education Press
It takes two to four steps
At least 50 questions
thank you

1. The chemical fertilizer plant plans to produce 7200 tons of chemical fertilizer. It has been producing for four months, with an average of 1200 tons of chemical fertilizer per month, and the remaining 800 tons per month. How many months will it take to complete the production?
2. The plastic factory plans to produce 1300 pieces of plastic moulds, 780 pieces in six days. According to this calculation, how many days will it take to complete the rest?
3. Master Li produced 252 parts in 4 hours in the morning, and worked for 3 hours in the afternoon at this speed. How many parts did Master Li produce in one day?
4. The cement plant plans to produce 3600 tons of cement, which will take 20 days to complete. The actual daily production is 20 tons more than the plan, how many days to complete the task?
two
5. A pile of 3.6 tons of coal can be burned for 10 days. After the improvement of the stove, 0.06 tons of coal can be saved every day compared with the original plan. How many days can this pile of coal be burned now?
6. The distance between Party A and Party B is 420 kilometers. A bus is planned to travel 7 hours from place a to place B. the actual distance is 10 kilometers more than the original plan. How many hours does it actually arrive?
7. Xiaoqiang goes back to school from home. If he walks 50 meters every minute and returns to school in 12 minutes, if he walks 10 meters more every minute, how many minutes in advance can he return to school?
8. Build a 6.4km long highway. In the first three months, build 1.2km per month on average, and the rest 1.4km per month. How many months will it take to complete?
9. Xiaoming used 10.2 yuan to buy Stationery, bought 6 pencils, each 0.45 yuan, the remaining money to buy ballpoint pens, each 2.5 yuan, how many can he buy?
10. The clothing factory originally planned to make 120 suits, each suit using 4.8 meters of cloth. After improving the cutting method, each suit can save 0.3 meters of cloth. How many suits can the original cloth make now?
11. For a story book, 576 words were arranged on each page and 25 pages were arranged. When it was reprinted, the characters were reduced to 18 pages. How many more words are arranged on each page now?
12. A passenger train and a freight train depart from Party A and Party B at the same time. The passenger train runs 80 kilometers per hour and the freight train 60 kilometers per hour. After five hours, the two trains meet. How long is the railway between Party A and Party B?
13. Two engineering teams open a 1500 meter tunnel at the same time. Engineering team a starts to dig 14 meters a day at one end, and engineering team B starts to dig 16 meters a day at the other end. How many days later can the tunnel be dug through?
14. Party A and Party B work together to type a manuscript of 7000 words at the same time. Party A will type 600 words per hour, and Party B will type 200 more words per hour than Party A. how many hours can we finish the task?
15. Xiaoming and Xiaoqiang walk in the opposite direction at the school gate after school. Xiaoming walks 70 meters per minute, Xiaoqiang walks 68 meters per minute. How many meters is the distance between them five minutes later?
16. The distance between a and B is 630 kilometers. Two hours after the bus leaves from a, the truck leaves from B. It is known that the bus runs 65 kilometers per hour and the truck runs 60 kilometers per hour. How many hours after the truck leaves, does it meet the bus?
17. The machine tool factory originally knew that each machine tool used 1.02 tons of steel. After the improved design, each machine tool saved 0.12 tons compared with the original one. How many machine tools can be manufactured with the steel used for 300 machines?
18. Xiao Ming bought 6 pencils and 4 exercise books, each exercise book is 0.68 yuan, each pencil is 0.24 yuan. Xiao Ming paid 5 yuan, how much should he get back?
19. Train a and train B leave from the two places at the same time. Train a runs 80 kilometers per hour, while train B runs 70 kilometers per hour. After 12 hours, the two trains are still 110 kilometers apart. How many kilometers are there between the two places?
20. Guangming paper mill produced a batch of newsprint, which was originally planned to be completed in 28 days, and needed to produce 12.5 tons per day. The production was completed three days ahead of schedule. How many tons more per day than the original plan?
21. Master Li produces a batch of parts, 126 of which were produced in the first three days. According to this calculation, the production task will be completed in another 12 days. How many parts are there in total?
22. The chemical fertilizer plant plans to produce 84 tons of chemical fertilizer in 30 days. The actual daily production is 0.2 tons more than the plan. How many days ahead of schedule can the task be completed?
23. Processing a batch of clothes, 300 sets per day, can be completed in 16 days,
(1) If you process 400 sets a day, how many days in advance?
(2) How many days can we finish if we process 20 more sets every day?
(3) If it is to be finished 5 days in advance, how many sets should be processed every day?
24. An automobile factory plans to produce 16800 cars in the whole year. As a result, the production task of the whole year is completed two months ahead of schedule. At such a speed, how many cars can be produced in the whole year?
25. One workshop of Xinfeng agricultural machinery factory processes 2480 parts. Originally, it processes 100 parts a day. After 20 days, it processes 120 parts a day instead. In this way, the task can be completed in a few more days?
26. A clothing factory used to make a kind of children's clothing with 2.2 meters of cloth for each set. Now it improves the cutting method and saves 0.2 meters of cloth for each set. How many sets of cloth can be made for 600 sets of this kind of clothing?
27. Xiaohong bought three exercise books and three new word books, each of which costs 0.36 yuan for an exercise book and 0.32 yuan for a new word book. How much less does Xiaohong spend on new word books than on exercise books?
28. Students carry water to water the trees. In the third grade, 45 trees are watered. In the third grade, 10 trees are watered less than in the fourth grade. In the fourth grade, half of the trees watered in the fifth grade are watered. How many trees are watered more in the fifth grade than in the third grade?
29. Two engineering teams jointly open a tunnel, each from one end. The first team opens 12.6 meters a day, and the second team opens 14.4 meters a day. The first team opens five days later, and the second team joins. In 21 days, the tunnel is finally opened
(1) How long is the tunnel?
How many meters did the two teams dig when they got through at 30 (2)?
31. Cars travel 63 kilometers per hour. The speed of cars is 1.4 times that of trucks. They travel from two places 270 kilometers apart at the same time and face each other
(1) After a few hours?
(2) How many kilometers did the two cars travel when they met?
(3) If the departure time is 8:15, what time is the meeting time?
32. The road construction team has to build a 180 km long road. It used to build 6 km every day. After 15 days, it will speed up and build 7.5 km every day. How many days will it take to finish this road?
33. The construction site needs 106 tons of sand, which will be transported 15 times by car, 2.4 tons each time. The rest will be transported by big car, 5 tons each time, and how many times will it be finished? (draw and inspect)
34. Zhang Li bought 4 copies of fables and 4 copies of English humor. He paid 20 yuan in total and recovered 7.6 yuan. Each copy of fables is 1.6 yuan. How much is English humor?
35. There used to be 30 boats in the people's Park, and the daily income is 540 yuan. Now there are 15 more boats than before. How much is the daily income now?
36. The TV factory originally planned to produce 1680 color TV sets in 36 days, half of which was completed in the first 16 days. The rest is planned to be completed in six days. How many sets are produced per day on average?
37. There is a batch of coal in a factory. Originally, it was planned to burn 5 tons of coal every day, which can last 45 days. In fact, if 0.5 tons of coal is burned less every day, how many days can this batch of coal be burned?
38. The school bought a 150 meter long plastic rope. First cut off 7.5 meters and make three jump ropes of the same length. According to this calculation, how many plastic ropes can be made?
39. To build a canal, the original plan was to build 0.48 km per day, which was completed in 30 days. In fact, an additional 0.02 km per day was built. How many days did it actually take?
If you read 32 pages a day and finish it in 15 days, how many days in advance can you finish reading 40 pages a day?
41. A car has traveled 260 kilometers in 4 hours. At this speed, it has traveled for another 2.4 hours. How many kilometers have it traveled before and after? (answer in two ways)
42. Shihe farm first sent 8 harvesters to harvest late rice. They harvested 19.2 hectares in the first two days, and then increased to 13 harvesters. They used the same speed for another 4 days. How many hectares did they harvest?
43. There is a distance of 600 kilometers between a and B. a bus and a freight car drive from a to B at the same time. The bus arrives 4 hours earlier than the freight car. When the bus arrives at B, the freight car runs 400 kilometers. How long does it take for the bus to complete the whole journey?
three
44. Party A and Party B are 500 kilometers apart. Party A travels 30 kilometers per hour and Party B 20 kilometers per hour. How many hours do you meet when you start at the same time?
45. There are 210 color TV sets in the shop, 21 more than three times of black-and-white TV sets. How many black-and-white TV sets are there in the shop?
46. Use a 12.4 decimeter long iron wire to form an isosceles trapezoid. It is known that the two sides of the trapezoid are 6.4 decimeters long and the area is 9 square decimeters. How many decimeters is the height of the trapezoid? (use the equation to solve)
47. There are several geese and ducks in the river, of which the number of ducks is four times that of geese?
48. A forest farm needs to plant 2000 trees, with an average of 350 trees per day in the first three days. For the rest, how many trees should be planted per day?
49. The bottom of a triangular flower bed is 14 meters and the height is 70 decimeters. How many square meters does this flower bed cover?
four
50. Two identical trapezoids are 15 cm long at the top, 24 cm long at the bottom and 12 cm high. If the two trapezoids are combined into a parallelogram, what is the area of the parallelogram?
five
51. The area of a triangle is 390 square centimeters and its height is 26 centimeters. How many centimeters is its bottom?
six
52. A parallelogram vegetable field has a bottom of 30 meters and a height of 25 meters. If you harvest 15 kilograms of vegetables per square meter, how many kilograms of vegetables can you harvest at a time?
seven
53. A trapezoidal orchard, 58 meters at the top and 44 meters at the bottom, 20 meters high. If an apple tree is planted every 4 square meters, how many apple trees can be planted in this land?
eight
54. An express train and a local train meet on the way. The express train is 400 meters long and runs 1100 meters per minute. The local train is 600 meters long and runs 900 meters per minute. How many minutes does it take for the two trains to meet and leave completely?
nine
The cross section of a 2m long ventilation pipe is a circle with a diameter of 2 decimeters. How many square decimeters of iron sheet is needed to make this ventilation pipe?
2. An 80 cubic centimeter iron block is immersed in a rectangular container with a bottom area of 20 square centimeter. The water surface is 10 cm high. If the iron block is fished out, how high is the water surface?
3. How many square meters of iron sheet should be used at least to make 12 rectangular iron sheet chimneys, each of which is 2 meters long, 4 decimeters wide and 3 decimeters high?