Mathematical knockout: a simple problem that will determine in two counts how well you can count in your mind

Today’s children are less and less aware of How to learn to count in mind. After all, everyone has a smartphone at hand, on which you can solve any example. Yes, and comrade "Google" you can ask any question and immediately get a detailed answer. Why, then, wipe your pants in boring lessons every day, trying to put more knowledge into your head?

In fact, studying any subject helps to broaden your horizons, allows you to learn more about the world and better understand your place on this planet. And the ability to manage numbers in life is definitely useful. The more necessary will be the ability to count in the mind, because with numbers a person today is faced at every step.



Surely every adult is sure that he knows how to count in his mind. But is that really true? Today's edition. "Site" It will offer some simple examples where you need to find a solution without asking for help from a calculator.

1. The first example is shown in the picture below. All you need to do is add 87 to 29. However, it is important to pay attention to how you are looking for a solution. It is the sequence of actions that will show how much you really know how to count in your mind.
   
   
   
   
2. Next, we offer a more complex example, but here you can also cope without a calculator and any entries on paper. The main thing is to be careful not to make a mistake in the decision process, otherwise the final answer is unlikely to be correct.
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   Publication from IQ007 School (@iq007skgora)
   
   
   
   
3. And finally, we suggest in your mind to calculate what numbers are hidden behind images of cats, mice and pieces of cheese. And keep everything in mind is not so easy, but you can immediately assess how well you are able to operate with numbers without a calculator and a pen with paper.
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   Posted by Top Kids Kids Club (@top_kids_ufa)
   
   
   
   

Tips and answers to tasks

1. The teacher of mathematics assures that in the mind you can add large numbers. But for this, a person must be able to break down each complex task into several simple ones. And you also need to be able to add numbers to 10 without errors. In our case, 29 + 87 = 20 + 80 + 9 + 7 = 100 + 16. As you can see, using such an algorithm, it is quite simple to add two numbers in your mind.
   
   
   
   
2. From the first example we understand that one apple equals 18/3 = 6. Then two bunches of bananas (4 pieces each) are equal to 14 – 6 = 8. Hence, a bunch of four bananas equals 8/2 = 4. And behind a bunch of three bananas in this case, there is a three. Then the two berries are equal to 4 – 2 = 2. The last example is 2 + 6 + 3 = 11.
3. Immediately it is easy to calculate that the cat hides four (the square root of 16). Then behind the mouse there is a three (the square root of 9). Then three pieces of cheese equal 72 / 12 = 6. From here, behind one piece of cheese, apparently, there should be a deuce. Therefore, the last example is quite possible to imagine: 4 – 3 + 2 = 3.
   
   
   
   

We hope that you have managed to solve these examples in your mind even without our prompts. More often solve with us similar problems to keep the brain in good shape. Then you will have to seek help from the calculator only in the most extreme cases.