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The following are some common types and methods of quick and clever calculations in primary school Mathematical Olympiad: ** 1. Clever calculations in addition ** 1. ** Rounding Method ** - When adding several numbers, if there were two numbers that could be added together to get a whole ten, a whole hundred, a whole thousand, etc., they could be added first. For example, 24 + 44+56, because 44 + 56 = 100 is a whole hundred, so first calculate 44+56, then add 24, that is, 24+(44 + 56)=24 + 100 = 124. - For an equation like 53+36 + 47, because 53+47 = 100 was a whole hundred,+47 could be moved with the sign to the front of +36, and then (53+47)+36 = 100+36 = 136. 2. ** Split and Rounder Method ** - In the case of 96+15, 15 was split into 15 = 4+11, because 96+4 = 100, which could be rounded up first, that is, 96+15 = 96+(4+11)=(96 + 4)+11 = 100+11 = 111. - For 52+69, since 69+31 = 100, 52 was split into the sum of 21 and 31, and then 31+69 = 100 was rounded up, which was 52+69=(21+31)+69 = 21+(31+69)=21 + 100 = 121. - When calculating 63+18+19, 63 was split into 63 = 60+2+1. Because 2+18 and 1+19 could be rounded up, 63+18+19 = 60+2+1+18+19 = 60+(2+18)+(1+19)=60+20+20 = 100. 3. ** The clever calculation of adding the same number ** - For 28+28+28, you can think of it this way, because 28+2 = 30 can be rounded up, but in the end, you have to subtract the three additional 2s, that is, 28+28+28=(28 + 2)+(28 + 2)+(28+2)-6 = 30+30+30 - 6 = 90 - 6 = 84. ** 2. Clever calculation in the substitution (position swap method)** - In an algorithm, the position of the numbers could be changed, and the order of the calculation of the numbers could be changed. For example, 632 - 156 - 232 = 632 - 232 - 156 = 400 - 156 = 244. ** 3. Clever calculations in multiplication ** 1. **"Tongbu" and "Butong" Quick Calculation Method ** - If the sum of two numbers was equal to 10, then the two numbers were complementary. In the integral multiplication operation, for example, 72×78, where the ten digits of the multiplication and the multiplication were the same, and the single digits were complementary (this kind of formula was called "same head, complementary tail" type), and 26×86, where the ten digits of the multiplication and the multiplication were complementary, and the single digits were the same (this kind of formula was called "complementary head, same tail" type), there were very simple and direct fast calculation methods. They were called the "same-complementing" fast calculation method and the "complementing the same" fast calculation method. ** 4. Other methods ** 1. ** Borrowing Method ** - Borrowing a number from a number, turning it into a whole ten or a whole hundred or a whole thousand, and finally, deducting the borrowed number. For example, 9+99 +999+9999=(10 - 1)+(100 - 1)+(1000 - 1)+(10000 - 1)=10+100 + 1000 + 10000 - 4 = 11106. 2. ** Choose a reference number ** - Among all the numbers, find that everyone is close to this number (this number is the benchmark number), first multiply the number of numbers by this benchmark number, and finally, subtract the excess. For example, 489+487+483+485+484+486+488. First find the base number 490 among these numbers, then use 490×7. Finally, subtract the excess, which is 490×7 - 1 - 3 - 7 - 5 - 6 - 4 - 2 = 3430 - 28 = 3402. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

When British photographer George Turner was filming animals in Africa, he happened to encounter a very rare black serval and took pictures of it. The Wildcat Haven animal protection organization in the United Kingdom used infrared cameras to capture a three-month-old Scottish wild cat cub in the Clashindarroch forest in northwest Wales. Several infrared cameras were placed in the wild for two months before they were captured. The Scottish wild cat was the rarest wild cat subspecies, with only about 35 wild individuals left. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Hengxin Cinemas provided online viewing of the first and second seasons of the anime series, including free viewing of the complete series and the broadcast address of the high-definition 4K. Hurry up and click on the link below to return to the super classic " Lord of Mysteries "!

Ouyang Nana and Chen Feiyu sang " Secret Language " together. The song was officially released on June 20, 2017. It was a throbbing promotional song for the movie " Secret Fruit." The song was set in a young campus and told a young campus love story. In addition, they also sang the theme song of the movie "The Secret Fruit" together,"For My Seventeen-Year-Old Self." While waiting for the TV series, he could also read the exciting content related to this site!

The following were some ancient novels: - "The Vicious Female Supporting Salted Fish Is Here": It was a novel about the female supporting character's counterattack. The plot included daily fights in the house and the Shuraba. The relationship between the characters was between a beautiful salted fish noble daughter and a scheming and crazy prince. - "The Prime Minister's Wife Is the Richest Man": It was a sweet and favorite story of the old saying that men were strong and women were strong. The story was about love after marriage. The characters were a rich young lady who was addicted to making money and a black-bellied and stingy future powerful minister. - "After Dressed as the Sold Female Lead": This is a sweet and popular story about the female supporting character's counterattack. It contains elements of daily delicacies and making a fortune. The characters are a smart little cook and a black-bellied sickly person. - "18 Styles of Chasing Her Husband": An ancient novel for a woman chasing a man. It's relaxing and fun. The plot is interesting. The characters are cute and clever daughters and loyal dogs with facial paralysis. - "I Ran After Flirting with the Violent Prince": It was a sweet and classic story about the female supporting character's counterattack. It had healing and redemption elements. The style of writing was relaxed and idiotic. The male and female protagonists were a salted fish, a foodie, and a violent, pure, and crazy prince. - "Charming": An old saying about women flirting with men. The style of writing is relaxed and cheerful. The plot starts from the confrontation between the male and female leads in the early stage to the male lead turning into a crazy demon who dotes on his wife in the later stage. The characters are the salted fish drama queen and the abstinent crazy male lead. - "Food Blogger Dressed as a Cannon Fodder": This is a classic classic story about the counterattack of cannon fodder. The description of food is very unique. It has a sense of image and imagination. The characters are a smart and capable little chef and a proud young general. - "A Thousand Miles Under the Bright Moon"(also known as "Marry a Monk"): The story is about the love between a princess of the Han family and an eminent monk from the Western Regions. The plot is slow but worth watching. - "Crossing Yang Qi": A story about a modern animal entering a Chinese studio. The female protagonist dressed as Yan Chixia and had a series of entanglements with the male ghost, Yu He. It was a story about love at first sight. The two were clean and the ending was He. - "Long Aotian's Villain Junior Sister": The female protagonist transmigrated into Long Aotian's Immortal Cultivation. She was originally the only daughter of the sect master of a large sect, but she found herself a villain who would do evil things in the future. The plot was interesting. - "Married to the male lead's uncle after transmigrating": The female lead transmigrated to become a cannon fodder female supporting character. The original cause mistakenly believed in the male lead and ended up tragically. The female lead changed her fate after transmigrating. - 'I'm Reborn in the First Assistant's Imperial Examinations' was a novel about rebirth and love. It told the story of Qiao Nan using the prophet to start her career after rebirth and Yu Zhou marrying Qiao Nan after she was reborn. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The VIP unlocked version of Poison Tyrant had the most beautiful desktop pet. The user could place the virtual pet on the desktop of the mobile phone and interact with it. The desktop pet could become the user's exclusive AI assistant. The user could directly ask Poison Tyrant questions that they did not understand, and they could also have voice interactions. Entering a question on the interface and clicking send would receive the answer. On the personal assistant interface, clicking the writing assistant could help with literary creation. For example, typing an introduction would draw a vivid article, and at the same time, it could also communicate with various virtual historical celebrities. Tabletop pets could be customized, such as color, dress, style, etc. They could blink, wag their tails, and other interactions. There were also weather forecast, calendar reminders, and other tools. The table pet could also be shared. The user could share it with friends, or share the pet's growth experience with friends. They could also customize their table pet. Each time, they could give the table pet a customized dress. The software also had some entertainment functions. When the desktop was opened, the table pet's entertainment interaction was super strong. Moreover, the size and clarity of the table pet could be adjusted on the desktop to avoid blocking some application icons. While waiting for the TV series, you can also click on the link below to read the original work of " Little Fox Demon Matchmaker " to understand the plot in advance!

The preserved plums generally didn't have any antidote. After drinking Chinese medicine, one could usually eat preserved plums appropriately without affecting the normal effects of the medicine. Preserved plums could be used as food ingredients. They did not contain any Chrysanthemum, but were rich in nutrients such as fiber, calcium, iron, potassium, and vitamins. They could promote the movement of the stomach and intestines and improve constipation. When taking the traditional Chinese medicine decoction, due to the bitter taste of the medicine, the preserved plum can be properly eaten after taking the traditional Chinese medicine, which can relieve the uncomfortable feeling of bitter mouth; When taking the traditional Chinese medicine for treating the symptoms of dry throat, dry mouth, cough, less phlegm, sticky phlegm and difficulty in coughing out caused by excessive internal fire or yin deficiency and internal heat, the preserved plum can be eaten appropriately, which has the effect of nourishing yin and promoting the production of saliva, and has a certain relieving effect on the uncomfortable symptoms such as dry mouth and tongue. However, preserved plums may have added more sugar or salt during the processing process. Some may also contain preserving agents, coloring agents, flavors, etc. Regular consumption will affect health, so it is not recommended to eat too much. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

" The red tourist attractions in Gaoyang County include the former site of the Buliliufa Arts and Crafts School, which is a national key cultural relic protection unit. Comrade Cai Hesen once planted a red fire here. The Gaoli Riot Memorial Hall is located in Beixinzhuang Village, Gaoyang County. It was built to commemorate the revolutionary martyrs who died in the 1932 Gaoli Riot. It is a provincial patriotic education base and is also a scenic spot in the list of China's red tourism classic scenic spots. The riot was also used as the blueprint for the novel 'Red Flag Book'; Xie Xiumei Memorial Hall was located in Yudi Village, Xiaowangguozhuang Town, Gaoyang County. It was built to commemorate the only female soldier among the 154 first-class meritorious service in the War to Resist the United States and Assist Korea, Xie Xiumei. "Journey to Gaoyang" is equally exciting. Everyone is welcome to click and read it! "

Luo Yan was the deputy director of the Fujian Province Establishment Office. He participated in a number of work affairs, such as visiting the retired cadres and workers of the Provincial Party Committee on behalf of the office meeting, issuing the "50 Years of Glory in the Party" Commemorative Medallion to the old party members and reporting the work situation, participating in the work related to the Party Discipline Learning and Education Class for the retired cadres and workers organized by the Provincial Party Committee; In the 33rd "Five High Lectures" and Central Group Learning (Expansion) Conference organized by the Provincial Party Committee, as the deputy director, he shared his experiences and ideas with everyone around the spirit of the learning session and combined with his post responsibilities. In addition, he also participated in the party day and volunteer service activities jointly organized by the Provincial Party Committee and the Provincial Forest Bureau. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The Ranwen novel website provided free reading services for the latest chapters of the "Divine Emperor of Ten Thousand Races", but it did not mention whether the full text could be downloaded. It was unable to accurately answer the question about the latest version of the "Divine Emperor of Ten Thousand Races" novel. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>