27 application questions Grade 4 difficulty .

1. Application questions about the calculation of the area of parallelograms, triangles, and trapezoids 1. PLA soldiers reclaim a parallelogram vegetable field. It has a base of 24 meters and a height of 16 meters. What is the area of the land?

2. How many square meters is the area of a trapezoidal wheat experimental field, with an upper bottom of 86 meters, a lower bottom of 134 meters, and a height of 60 meters? How many hectares? 3. A triangular piece of land, the bottom is 358 meters, the height is 160 meters, how many square meters is the area of this land?

How many hectares? 2. Summing up the application problem 1. The PLA transport company transports a batch of coal, and if each truck is loaded with tons, it takes 16 vehicles to transport it at one time. If each truck is loaded with 6 tons, how many vehicles do you need to transport it all at once?

2. Students arrange flowers, each person puts 9 pots, and 36 people are needed; If you want 18 people to put it, how many pots should each person put it? 3. Three-step calculation application problems Sun Gou Primary School held a mathematics knowledge competition. There were 60 participants in the third grade, 45 in the fourth grade, and twice as many in the fifth grade as in the fourth grade.

How many students from the three grades participated? 4. Encounter Application Question 1: Zhang Ming and Li Hong set off from the two places at the same time and came to each other. Zhang Ming walked 50 meters per minute, Li Hong walked 40 meters per minute, and after 12 minutes, the two met.

How many meters are the two apart? 2. A and B are 255 kilometers apart, and two cars drive from the two places at the same time. Car A travels 48 kilometers per hour and vehicle B travels 37 kilometers per hour.

5. Solving simple equations 1. Xiangqun Stationery Factory can produce 250 stationery boxes per hour. How many hours can you produce 10,000 pieces? 2. The factory brought a batch of coal, burned 28 tons, and there were 13 tons left.

How many tons of coal are in this batch? (Answer in two ways) 6. Application questions about the calculation of cuboid, cube, surface area, and volume (volume) 1. A cuboid iron box, 18 cm long, 15 cm wide, and 12 cm high. How many square centimeters of iron sheet do you need to use to make this iron box?

2. What is the surface area and volume of a cube with a length of 15 cm? 1.Two trains depart from A.

B and B drove opposite each other at the same time and met 48 km from the midpoint four hours later. It is known that a slow train is five-sevenths of the speed of a fast train, what is the speed of a fast train and a slow train? How many kilometers are A and B apart?

2.A batch of parts can be completed in 12 days by the cooperation of A and B. After they had worked together for a few days, B took a leave of absence for an errand, and B had only completed three-tenths of the total task.

A continued to do it, and it took 14 days from the beginning to the completion of the task. I ask you: How many days did A do it alone?

3.The construction of a section of the road was originally planned to be completed in 50 days for 120 people. After a month of work (calculated as 30 days), 20 people were transferred to repair other sections.

How many days will it take for the rest of the people to work longer than originally planned to complete the task? 1 The bell of the railway station strikes several times at what time, such as 1 o'clock, 2 o'clock, and every half hour. Q: How many times does this bell ring in a day and night?

Two groups of students went to pick flowers, group A picked 123 flowers, group B picked 57 flowers, and asked how many flowers from group A to group B would make group B 4 times as large as group A?

There are 48 students in the fifth grade, and the number in the sixth grade is more than double that of the fifth grade.5 How many are in the fourth and fifth grades combined?

Xiao Ming is 8 years old this year, his father is 37 years old, and his mother is 35 years old. A few years later, the age of the parents and 6 times that of Xiao Ming?

Six years later, 15 years ago, the father was 7 times older than the son, and 10 years later, the father was twice as old as the son. How old are father and son this year?

50 for fathers and 20 for sons

The highest digit of the two nine-digit digits is 7, the 10,000 digits are the same as the 10-digit digits, the numbers on the other digits are different, and the maximum difference between the digits is 9 (one is 9 and one is 0) due to the absence of other conditions

The difference between 10,000 and 10 digits is 0, so the maximum difference is 99909909.

You can do it with **, I used to do it with **.

Let's take a look at whether to save some with a large truck or a small truck:

372 186 = 2 (yuan) A large truck costs two yuan to transport a package.

208 102 yuan) for a small truck to transport a package.

So we try to use as many large trucks as possible, and then column **:

Large trucks, small trucks, and small trucks can transport cement and package freight yuan.

A: With three large trucks, one small truck is the most economical.

Which car pulls more, which one uses less freight.