How to find a percentage of numbers

Study at school, children think that teachers ask lessons so much. Especially in mathematics, these knowledge may not be needed in life. But when you grow up, you understand how I did not proceed and passed a lot of ears. Now you have to learn again. After all, without knowing, you do not even consider what percentage will remove you when you withdraw money from a plastic credit card for cashing.

The easiest way is to calculate, which percentage is the number through the worldwide network. To do this, you need to go online and click here on page. There, only insert the data into the right fields, and the result will calculate the calculator. For example, how to find out how much percent is the number 15 from 13. To do this, insert 15 insert 15 into the second string, and then 13, click "count". Calculator issues: 115,38461%.

From the textbook of mathematics for the fifth grade it is known that the percentage (%) is a hundredth part of this number. Example: Find 675 from 4500. We compile a proportion, we use the Rule of the Cross: those data that are opposite each other, and in the third number divide. And we write numbers under numbers, interest under interest:

4500 – 100%;

675 - x%;

x \u003d (675 * 100) / 4500;

x \u003d 67500/4500 \u003d 15%.

It is not difficult to find out the percentage and on the usual calculator. You can simply calculate how in the second point. There is still a way, tell us on the example. We know the number - 8700, it is necessary to find how much it is 47% of this number. We do the following:

We type on the calculator: 8700;
Click "Multiply" (*);
Then: 47;
Press the "interest" button (%);
Then "equal" (\u003d);
It turns out: 4089

If you are near the PC, there is no sheet and handles, and you need to know how much 47% of 8700 will be 4700. Then on the desktop, create "Microsoft Excel Sheet", open the document, enter the following on the keyboard:

Equal (\u003d)
Then: 8700.
Click on "Multiply" (*)
Then 47.
Press the key (%)
At the end, click on "ENTER".
Will: 4089.

Do not forget that the calculators are on mobile phones (in applications), on computers and laptops in the "Start" menu. And how to find% of the number on the calculator - look at paragraph 2.

Knowing all these tricks, now can easily determine the percentage of a certain number. Such knowledge today is very necessary. And at least sometimes perform calculations in the column, so as not to forget the multiplication table.