What is the percentage of the number of mothers

At first glance, percentage problems seem to be extremely simple. But when you need to quickly estimate in your mind the size of the discount on a particular product, we somehow and then fall into a stupor. How to calculate percentages on a calculator and how to do it in your mind with a small mathematical life hack? The answers are waiting for you in our article.



British Ben Stephens shared on his Twitter a simple mathematical trick that greatly simplifies the calculation of percentages without a calculator. It can be formulated as follows: “A percent of B is the same as percent of A.”

Fascinating little life hack, for doing percentages:

% of y = y% of

So, for eample, if you needed to work out 4% of 75 in your head, just flip it and do 75% of 4, which is easier.

— Ben Screamings (@stephens_ben) March 3, 2019



It seems like nothing special, but in some cases it helps and more. For example, try to quickly calculate what will be 16% of 25. And 25% of 16? In both cases, the answer is 4, but to cope with the second example, agree, much easier.



“I have a degree in mathematics and never thought about it,” Ben tweeted. “Try to find 63% of 11,” the others say. Well, Ben's way really works better with multiples of 0 or 5. And 63% of 11 will be in the old-fashioned way.

How to Calculate a Percentage of a Number First way.. Multiply the percentage and the number by each other and then divide by 100.
63% from 11
63x11/100 = 693/100 = 6.93

The second way.. Divide the number by 100 and multiply by percentage.
63% from 11
11/100 = 0.11 0.11x63 = 6.93



By the way, it is easy to multiply in your mind any two-digit numbers by 11, we learned in the article on oral counting techniques.

What if instead of 63% of 11 you find 11% of 63? In my opinion, Ben’s life hack is quite applicable here.
63% of 11 is the same as 11% of 63
11% = (10+1)
63/10 = 6.3
63/100 = 0.63
6.3+0.63 = 6.93

How to find out the percentage discount Package of detergent cost in the store 400 rubles. Today in the discount store and on the price tag is 372 rubles. How to determine the percentage discount?



You need to make a proportion. We will accept the price without a discount for 100%, and the price with a discount for x %. Then the following equality will be just:
400/372 = 100/x
x = 372x100/400 = 93%
Accordingly, the discount is 7%.

To find out the percentage of the number, enter the number, the multiplication sign, then the desired percentage and the % sign. For a problem with a powder of 7% of 400 we find as follows: 400 × 7%





If you need to find out the price after the discount, type on the calculator: 400 - 7%.





A small hint: in order not to look for a calculator in the smartphone menu for a long time, use the browser address bar (both Yandex and Google will do).

Not all interest can be calculated, even armed with our instructions.





Interest on deposits, return on investments, overpayment on a mortgage - all this is easier to calculate using convenient online services.

So, a credit calculator at one click of a button will calculate the cost of the loan, monthly payments of repayment of the loan, the full amount of overpayment. A compound interest calculator will help with the calculation of compound interest in a bank deposit (when at the end of each period accrued interest becomes the principal amount).

Bright price tags, signaling discounts, can attract everyone. But you have to be vigilant. After all, for a motley scattering of interest with a minus sign, clever marketers sometimes manage to sell us goods even at higher prices than before the sale. Instead of falling into their traps, saving money and making life a little easier for you, hopefully our useful tips will allow.