1. 523 teachers and students participated in the tree planting activities. If 70 people are divided into a group, how many groups can they be divided into at most?

523÷70=7 groups ... 33 people died in 8 groups.

2. Enter a 466-word article by computer. Red can input 60 words per minute, and Congcong can finish it in 7 minutes. Who gets in faster?

466 ÷ 7 ≈ 66 > 60, so you are smart and agile.

3. Uncle Wang's orchard harvested 358 Jin of apples, 270 Jin of pears and 0/96 Jin of plums. Apples are 40kg per box, pears are 30kg per box and plums are 20kg per box. Let's calculate: How many cartons do you need for each of these fruits?

358 ÷ 40 = 8 ...38, so 9 270 ÷ 30 = 9196 ÷ 20 = 916, so 10.

4. Plant trees along the road with a length of 180m, and plant a tree every 20m. How many trees do I need to plant?

180 ÷ 20 = 9 9-1=10 tree

There are three times as many eggs in the box as in the basket. There are 96 eggs in a box. How many eggs are there in six baskets?

96÷3=32 32×6= 192

6. A story book has 448 pages. Obviously, it took 16 days to read it. Fangfang reads 4 pages more than Mingming every day. How many pages does Fangfang read every day?

448÷ 16=28 28﹢4=32

7. Chunguang Grain and Oil Company wants to export 680 tons of grain. How much do you need if you use a 22-ton container? How many 17 ton containers do you need? 680 ÷ 22 = 30 ...20 so 3 1 680÷ 17=40.

The expressway from Shijiazhuang to Chengde is 546 kilometers long. The Honghong family drove from Shijiazhuang to Chengde to visit the summer resort. If they drive an average of 78 kilometers per hour and leave at 8 am, when will they arrive?

546÷78=7

7-8 = 15

9. A rectangular vegetable field is 9 meters long and 6 meters wide. This vegetable field receives 972 kilograms of vegetables. How many Jin of vegetables do you collect per square meter on average? 6×9=54 square meters 972÷54= 18

Shanghai Oriental Pearl TV Tower is the tallest TV tower in Asia, with a height of 468 meters. The first floor 12 floor is 39 meters high. The height of the TV tower is equivalent to the height of several 12-story residential buildings. 468÷39= 12

1 1. Grandpa Wang's four cows produce 896 kilograms of milk every week. How much milk does an average cow produce every day/kloc-0?

896÷4÷732

12, four vehicles transport 960 bags of cement in three times. How many bags of cement does each car transport on average?

960÷4÷3=80

13, (1) There are three windows in each classroom of Shui Bo Primary School, and each window is equipped with 12 pieces of glass. How many pieces of glass have been installed in nine classrooms?

12×3×9324

(2) Liu Yang Primary School has 12 classrooms, each classroom has 3 windows, and each classroom is equipped with 324 pieces of glass. How many pieces of glass are installed in each window on average? 324÷ 12÷3=9

14, Xiaohong bought two boxes of mung bean cakes, one weighing 1 kg. There are 20 pieces in each box. How many grams does each piece weigh on average?

20×2 = 40 1k g = 1000g 1000÷40 = 25。

15. A bus leaves from Zhang Cun. If you drive at a speed of 60 kilometers per hour, it will take 4 hours to reach Lizhuang. It only took three hours to get there. How many kilometers does this car actually travel per hour on average?

60×4=240 240÷3=80

16, Baita Village plans to build a canal. If16m is built every day,18m can be completed. I built 24 meters on the first day. According to the progress of the first day, how many days can it be completed?

16× 18=288 288÷24= 12

17, Hong Guang Hotel bought 100 towels, each 6 yuan. How many towels can I buy if I buy a towel with this money of 8 yuan?

100×6=600 600÷8=75

18, a pack of A4 copy paper, 25 sheets a day, used up in 20 days. How many days can I use less than five cards a day?

25×20=500 25-5=20 500÷20=25

19, a professional beekeeper, raised 24 boxes of bees this year. Last year, 5 boxes of bees brewed 375 kilograms of honey. According to last year's honey output, how many Jin of honey can be brewed this year?

375÷5=75 75×24= 1800

20. Dongdongjia raised 135 trees on the land of 15 square meters. According to this calculation, how much land is needed to raise 990 trees?

135÷ 15=9 990÷9= 1 10

Application problems and answers (logical reasoning problems) of Olympic mathematics in grade four

A, B, C and D all have language barriers when they are together. We only know two of the four languages: Chinese, English, French and Japanese. Unfortunately, there is no language that everyone can speak, only one language that three people can speak.

(1) B can't speak English, but when A and C talk, he must translate.

(2) Party A can speak Japanese, while Party D can't understand Japanese, but they can talk to each other;

(3) B, C and D want to communicate with each other, but they can't find a language that everyone understands;

No one can speak Japanese and French at the same time.

Think about it: which two languages can A, B, C and D speak?

answer

Solution: According to (1), (2) and (4), B can't speak English, A can speak Japanese but can't speak French, and D can't speak Japanese.

Assuming that Party A can also speak English, it can be seen from (1) that Party A and Party C don't know each other's languages, so Party C can speak Chinese and French, while Party B can't know both French and Japanese, so Party B can speak Chinese and Japanese. According to (3), there is only one condition.

Assuming that Party A can still speak Chinese, we know from (1) that Party A and Party C have different languages, so Party C can speak English and French, while Party B, Party C and Party B can only speak Chinese and French. From (3), we know that Party D can't speak French, but Party D can speak Chinese and English, so that Party A and Party B can also talk to each other.

So A can speak Chinese and Japanese, B can speak Chinese and French, C can speak English and French, and D can speak Chinese and English.