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RachelBentley
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How to learn to count quickly in your head? Basic operations with numbers without a calculator

Why do you need an oral account?

Understanding numbers | LearnEnglish Teens - British Council

Verbal counting is an essential skill for people working with numbers and money. At least it was like that before, in the 21st century everyone has small computers in their pockets, called smartphones, and the ability to count in the mind fades into the background.

But it can always happen that the smartphone sits down or lies in the car, in another room, in general, it will not be at hand. What to do in this case? Of course, you can run for the phone, or you can just count in your head. Moreover, this can be done not only with single and two-digit numbers, but even with three-digit ones.

With advice from the experts at www.essayassistant.org you can add, subtract, multiply, divide, and also operate with percentages in your head . 

The advantage of such calculations will be to charge the brain in order to keep it in good shape, and in some cases, you can amaze others, especially of the opposite sex. So, get ready, now there will be a little warm-up for your gray matter!

Let's start with the simplest: mental addition

The first thing you need to be able to work with numbers in your mind is to accurately operate numbers up to 10 . In addition, it all comes down to manipulating single-digit numbers .  

A common mistake :
Most people forget to transfer the ill-fated ten to the next digit after addition when counting. To prevent this from happening, we advise you to use the "support for ten" method. Its essence lies in the fact that we mentally ask ourselves how much one of the terms is missing to 10 , and then we add the difference to 10 remaining to the second term.   

When it comes time to work with large numbers, then the division into the same categories mentioned above will come to your aid. Everyone remembers column addition? It's the same, only in your head.

How will it look in practice? Let's say you have a problem: add two numbers 1024 and 256 : in fact, what is 1024? 1000 + 20 +4. And 256 in turn: 200 + 50 + 6. Now we are working on the digits.   

1024 + 256 = (1000 + 0) + (200 + 0) + (20 + 50) + (4 + 6) = 1000 + 200 + 70 + 10 = 1280 .

Mental subtraction

With subtraction, a slightly different method, you do not need to split both numbers into digits, it will be enough to split the subtracted. Suppose you decide to subtract 256 from 1024, what is the easiest way to do this? We split 128 into digits. 128 = 100 + 20 + 8. And now we subtract . 

1024 - 128 = 1024 - 100 - 20 - 8 = 924 - 20 - 8 = 904 - 8 = 796.

Multiplication in the mind

First, let's remember what multiplication is? This is a repetition of the addition operation a number of times. For example, if you want to find out the sum of five nines, then this means that you multiply 9 by 5 . 

9 * 5 = 9 + 9 + 9 + 9 + 9 = 45.

And in order to successfully multiply large numbers in your mind, you first need to learn how to accurately count the multiplication of single-valued ones, and here the good old multiplication table comes to your aid . You will not achieve any success in multiplying multi-digit numbers without it.  

If you do not remember the multiplication table by heart, then we strongly recommend repeating it to the state of "bouncing off the teeth."

Multiplying Multi-Digit Numbers by Single-Digit Numbers

Multiplication table memorized to holes? Go to the next step, multiply by single-digit multi-digit numbers. Here, as with addition, division into digits comes to our aid. Suppose we want to multiply 512 by 8. 512 is 500 + 10 + 2, and we multiply each of these elements by the eight we need:

512 * 8 = 500 * 8 + 10 * 8 + 2 * 8 = 4000 + 80 + 16 = 4096.

In order to avoid mistakes, we recommend going from a lower category to a higher one. So there is less chance of losing the unfortunate decimal place in case of multiplication.

 

It should be understood that fast counting is very useful in many jobs. Especially in accounting. People who think well are the kings of this business. But if you still study and see that even with a quick account you have problems with accounting, ask us for help https://essayassistant.org/accounting-homework-help and together we will solve the problem that prevents you from moving on.

Useful Tips

We told you about the basic methods of working in the mind with all the classic operations, now a few general tips so that they are fixed in your place so that you can lift in the middle of the night, ask: "How much will 25% of 1024?", And you immediately answered " 256! " and went to bed.

  • Train every day.
  • Seems not working? Don't give up and train harder!
  • There are many apps for training oral counting, both on iOS and Android. Download and train with them.

 

If you liked our advice and want to get help from us already in more serious things, for example, if you want help with coursework in physics, where it is already difficult to count in your head, then do not hesitate to contact us https://essayassistant.org/physics-help/. Our experts are ready to help you by writing a term paper quickly and efficiently, so that as a result you will receive an "excellent" grade. 

 

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