It is a pity that the school now does not teach how to calculate a percentage of the number by the simplest method.

Every branch of mathematics is incredibly important. And it is enough for schoolchildren to learn a topic poorly, as all subsequent lessons will be difficult and incomprehensible for them. That would discourage spending time on mathematics. As a result, both test papers and tests with exams will turn not into a test of knowledge, but into a stressful phenomenon that you will want to quickly forget.

Today's edition. "Site" I want to talk about how kids are taught to do things with interest. Because How to calculate a percentage of the numberThe student should know already in the sixth (or even fifth) grade. But is this important and applicable topic in adult life easy for everyone?

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How to calculate the percentage of the number "My son is studying well, this year he finished the 5th grade." I know that he can forget a lot during the holidays, so we periodically arrange a repeat of the material passed with him. I believe that 2 classes a week will not spoil his vacation, but next year he will fit in good shape, writes Daria.



“The other day, we repeated the actions with interest. And such tasks, when you want to find the right percentage of a certain number, are given to him easily. But I've noticed how children are taught to do that in school.”

If, for example, you want to find 70% of 90, then the child makes up a proportion where 90% refers to an unknown number (), as 100% refers to 70%. Then we multiply 90 by 70 and divide by 100. That is 90 * 70 / 100 = 63.



“It seems to be a simple problem, but to solve it, a child has to spend a lot of time on all the records with proportions. And then I showed him the way I used it in school. I think my grandfather showed me this basic trick.

If, for example, you want to find 30% of the same number 90, then we do not make a proportion, do not paint everything on a whole page, but simply write down the numbers 9 and 3 and multiply them. It turns out 9 * 3 = 27. That is the correct answer. And if you want 60% of 80, then just 6 * 8 = 48. Easy as that!



“I showed my son this simple way, and the child was quite surprised that everything could be solved so quickly. He said they don't teach them that in school, they make them write every example. But why complicate it? – wonders Daria.



Probably, the ability to make proportions to the child will come in handy more than possession of the last way that Daria described. After all, with the help of proportion, the child thinks more and understands the whole process. And if the conditions of the problem change, and it will be necessary to find not a percentage of the number, but a percentage number, then here he will cope with the help of proportion.

And what will the student do next when the tasks become more difficult and you need to find not 70% of 90 and not 60% of 80, but, say, 35% of 78? If you know that 1% is one-hundredth of a number, if you know how to leave “complex and cumbersome” proportions, you will find it. right-way.



And if it is difficult to describe the proportion, then you can always simplify it if the child has already clearly understood what interest is and how to work with them. But if you show the “easy way” before the student understands the whole process well, then the parent will not help, but only confuse the child even more.

And how did you learn to work with interest in your school? By proportion? Or was there another way to calculate a percentage of a number? And how quickly did the teacher explain the actions with interest? Tell me in the comments.