OMG! It wasn't until today that I suddenly realized that those top students who are good at arithmetic are not born gods, and the reason why they can excel in mathematics is actually because they have memorized these six quick calculation formulas backwards! This shocked me and gave me a new understanding of quick calculations.
For many parents with children, their children's oral arithmetic ability has always been a headache. Especially in elementary school, problems such as slow oral arithmetic speed and high error rate often plague children. Today, the six quick arithmetic formulas I want to share may be able to help children solve these problems and greatly improve their oral arithmetic skills.
First, let's take a look at these six quick math formulas. They are: head and tail.
10. The head and tail are complementary, the head is multiplied by the head, the head is multiplied by the head, the tail is added to the tail, the head is multiplied by the head, the head is multiplied by the head, and the head is subtracted. These mantras may seem simple, but they contain a wealth of mathematical principles and techniques.
Among them, "head and tail together" means that when the ten digits of two numbers are the same, the sum of the single digits is 10, then the product of these two numbers is the head multiplied by the head and the tail by the tail. For example, 23 27 = 621, because the head is 2 and the mantissa is 3 + 7 = 10, so the result is 2 (3 + 1) 100 + 3 7 = 621.
The "head and tail complementary" means that when the head of one number is the same as the tail of another number, and the sum of the heads and tails of the two numbers is 10, then the product of these two numbers is the head by the head, and the head by the head. For example, 23 47 = 1081, because the first 2 and the last 7 are complementary, and the sum of the first 4 and the first 2 is 6, so the result is 6 (3+7) 100 + 3 7 = 1081.
These quick math formulas not only make children more comfortable in oral arithmetic, but also exercise their mathematical thinking ability and logical reasoning ability. Moreover, these formulas have a wide range of applications, not only for multiplication of two-digit numbers, but also for multiplication operations with more digits.
Next, I will give you a few examples, so that you can understand the application of these quick calculation formulas more intuitively.
For example, let's look at the question: 12 14=? In the conventional way, we might start by calculating 12 10 = 120, then add 12 4 = 48, and finally get 168. However, if we apply the mantra "head to tail", we can get the result directly: 1 (2+4) 100+2 4=168. This not only eliminates the need for intermediate calculation steps, but also makes the results more accurate.
As another example, let's look at a slightly more complex question: 23 47=? If we follow the conventional method, we need to calculate the product of each bit step by step, and then add it up. However, if we apply the mantra of "head and tail complement each other", we can get the result directly: 2 (3+7) 100+3 7=1081. This quick calculation method is not only fast, but also highly accurate, so that children can be more confident in oral arithmetic.
In addition to these examples, there are many other quick math problems that can be solved quickly by applying these formulas. For example, after the head is added by one, the head multiplied by the head is suitable for the case where the head is the same and the mantissa is complementary, such as 23 27 = 621;The head multiplied by the head, and the tail plus the tail are suitable for situations where the head and tail are not the same, such as 12 46 = 552;After adding one head, the head is multiplied by the head, and the head is subtracted from the head is suitable for the situation that the head and tail are not the same, and the head is different by one, such as 23 22 = 506.
In conclusion, these quick math formulas are very helpful in improving children's oral arithmetic skills. By learning and applying these formulas, children can not only achieve better results in mathematics, but also develop their interest in mathematics and thinking skills. Therefore, parents with children may wish to let their children take a look and learn these quick calculation formulas, and usually do more relevant practice questions, I believe that the children's quick calculation ability will definitely improve!
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Imagine if your child had mastered the skills of quick arithmetic in just one month, their oral arithmetic speed would be greatly improved, and their math scores would improve significantly. This will build a solid foundation in mathematics for them, gradually narrowing the distance between them and the top students. Quick math skills will be a powerful assistant in their math learning and help them on the road to success.
Dear parents, don't hesitate any longer! Take action now and guide your child on a journey of learning quick math skills! I believe that in the near future, you will be pleasantly surprised to find that your child's mathematical thinking and grades have improved significantly. Let quick math skills become a powerful assistant for children's math learning and help them move towards a successful future! Million Creators Program