Mathematical Olympiad calculations and ingenious calculations in primary schoolThe 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.
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Numerology related calculationsNumerology was a theory that used numbers to predict and explain human fate and fortune. In Numerology, people use various numbers to represent human fate and fortune. For example, the numbers 0-9 represent different personality traits and life stages, while the number 10 represents success and wealth.
Numerology calculations usually required combining and calculating numbers to obtain a prediction result. These calculations included:
The calculation of the five elements of numbers: The five elements of numbers can affect the fate and fortune of humans. For example, the number wood, fire, earth, metal, and water could determine a person's character and class choice.
Combination of numbers: Different combinations of numbers can produce different results. For example, the combination of the numbers 5 and 3 means that there may be some challenges and difficulties, while the combination of the numbers 9 and 2 means that there may be some success and wealth.
3. Calculating the relationship between numbers and astrological signs and dates of birth: Numerology also involves calculating the relationship between numbers and human fate by calculating the relationship between astrological signs, dates of birth, and other factors.
It should be noted that Numerology is only a theory, and its predictions are not absolutely accurate. It is only for reference and entertainment.
Fan Sizhe's calculationsFan Sizhe had shown his outstanding ability to calculate in the TV series Joy of Life. He was good at doing business and was very sensitive to numbers. He could easily calculate complicated numbers. Under Fan Xian's guidance, he formulated a detailed plan, opened the Danbo Bookstore, and sold " Story of the Stone " and " Banxianzhai Poetry Collection," achieving great commercial success. Therefore, Fan Sizhe was very good at calculation.
E-book on macro calculations" Calculating the Big Balance: An Essay on Economics " was published by the Economics and Sciences Press in 2011. No e-book version was found.
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Zhao Jinmai's new drama finally arrivedZhao Jinmai's new drama is finally coming! Many of Zhao Jinmai's new dramas were about to start broadcasting or had already started filming. Among them were the suspense drama " Blown," the school drama " Those Youth Times That Can't Go Back," the ancient drama " Exquisite," and the romance drama " In the Blizzard." Although the specific plot and broadcast time were not provided, the news showed that Zhao Jinmai was actively participating in the filming of many new dramas, bringing more exciting performances to the audience. For Zhao Jinmai's fans, this was undoubtedly a piece of exciting news.
Did Sister Qiao finally marry into the countryside?In 'Dream of the Red Chamber', according to the verdict of the Twelve Beauties of Jinling and the relevant plot hints, Sister Qiao finally married into the countryside and became an ordinary village woman. The painting in the verdict depicted a deserted village and a wild shop, where a beauty was spinning. The verdict was: "When the power is defeated, the clouds are noble. When the family is dead, don't talk about relatives." It also indicated that Sister Qiao was sold by her relatives and saved by Granny Liu. She did not return to the Jia family, but fell into the countryside of a deserted village and became a village woman who made a living by weaving. It was also said that Sister Qiao finally married Ban 'er and lived a plain life as a farmer.
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What could be in Daniella Martins Secret Story?It's possible that the secret story is about her struggle with an identity crisis. Daniella Martins might have had to figure out who she really was in a complex situation, and this journey of self - discovery has been her secret so far. Maybe she had to break free from the expectations of others and find her true self, and this process is what makes up the secret story.
A novel recommended for writing tricks and calculationsI recommend the light novel " Everything is a Plan." It was a fantasy novel. The protagonist, Zhuge Yufeng, was intelligent and good at planning. He could strategize in all kinds of situations and play all kinds of tricks. This book was about scheming and scheming. It was very suitable for readers who liked this type of novel. In addition, there was also " I Am the Common Villain in the Fictions ". The protagonist had transmigrated to become the common villain of the three novels. In the original book, he used the advantage of the villain to push the original protagonists down from the altar. This novel was also a wonderful piece of work about counter-plots.
Reborn 50 military wives are divine calculationsReborn 50 Military Wife Is a Divination is a novel by author Yinghu Yuhe. According to the search results, the novel described a big data administrator who was reborn in 1999 and obtained a big data system in 2019. The protagonist started a wonderful life by knowing everyone's situation twenty years later. However, other than that, the search results did not provide any more information about the novel.