How many can you count by hand?

Count with one hand

On a rare weekend, the family sat together and chatted casually. We all sat on the carpet in my son's bedroom. I leaned my head against the quilt, relaxed and happy, listening to the two of them talking. Sometimes, I think whether a family is happy or not has nothing to do with material richness. People's feelings about happiness may be just some simple psychological needs. Just like this, we can be together and it doesn't matter what we do, such as watching TV, eating, chatting and even going out for a walk. As long as we are together, we can feel the need, care and love for each other.

However, I am well aware that the simpler this requirement seems, the more difficult it is to actually operate. If you don't have a certain economic foundation as the backing, you have to worry about food and clothing every day. I'm afraid no one can really be chic and relaxed. Birth, old age, illness and death is a major event that human society has to face, and behind everything, it is inextricably linked with the economic foundation. The road of life, every step, no matter who you are, no matter your personality, mentality, indifference to fame and fortune, ambition, can not be denied, this road needs money to pave the way. The difference lies in who pays and how thick the money is.

"Dad, how many numbers can you count with one hand?" Dege asked.

Dad blurted it out without thinking. "Ten."

Dege smiled and held out his hand. The clenched fist is zero or ten, and the others are one to nine. "Yes, isn't it?" After getting his father's approval, he went on to say, "I have a way to count thirty-one with one hand." Do you know how to do it? "

Count thirty-one with one hand, hehe, this is the first time I've heard of it. Look at dad. He obviously doesn't know either.

"Then you see, this ..." He raised his right hand and began to perform. From one to thirty-one, thirty-one states can be represented by one hand.

Seeing our surprised expression, Dege was a little proud. Dad smiled, then looked at me and said, "Do you know how he did it?"

I smiled and said, "Hehe, he used a binary method." Binary may be a difficult concept for ordinary people to understand, but it is a simple common sense knowledge for us. In fact, when Deco counted to the fourth number, I knew what method he used.

Dad nodded and turned to ask Dege, "Do you know what binary is?"

I remember telling him about the concept of binary a few years ago. Because he once asked me about computer knowledge and the principle of computer processing information, I simply introduced him to some binary, octal, hexadecimal, thirty-two and so on. Dege has always been good at math. My explanation is easy for him to understand and make some simple changes. I still remember that after I finished this knowledge, I asked him if he knew there were other decimal ways in daily life. He opened his eyes and thought about it, but he still couldn't figure it out. The cute appearance of the elf seems to be still in sight. I just reminded him, like time, how about every 60 seconds and every 60 minutes. The little guy immediately shouted happily, "Oh, I see. Is this sexagesimal?" Then I dialed him, how about every 24 hours, how many months and days there are in a year, how many decimal places there are, and so on. In this way, Dege learned a lot about the decimal system.

However, when he put it into practice, Dege obviously didn't realize that the counting method he just used was binary knowledge. Not only that, he has forgotten the concept of binary. He asked, "Huh? What is binary? "

Dad explained: "The so-called binary system, to put it bluntly, means to take one of the two." You see, your fingers have just had two states, one is bent and the other is straight. Bend means one, straight means zero, thumb means one, and one plus one means two. In binary, there is no number two, and when it reaches two, it will go up, so you use your index finger to represent two, and then ... "

With the previous indoctrination as a foreshadowing, these mathematical knowledge is really very simple for Dege. Needless to say, he knew everything at once. Just one thing, which he didn't notice and my dad didn't mention, I said to Dege, "Dege, there are still some problems with your counting method." Did you find it? " He shook his head and said he didn't know. "According to your method, you should be able to count to 32 instead of 3 1. You missed a number. " At this time, my father also said, "Yes, yes, the fifth power of two is thirty-two, and there should be a zero." I said, "fist represents zero." Dad shook his head again and again: "No, it should be a slap in the face." Yes, I forgot that they just use straight fingers to indicate zero.

In Deco's counting method, I can't express several numbers, such as 10000 (corresponding to decimal 16), the little finger is bent, and the other four fingers are straight. Dad can't do it either But Dege can easily work out all the numbers. I don't think my son's ability to control his limbs is necessarily worse than mine. I always laugh at his uncoordinated movements, running is not like running, doing exercises is not like doing exercises, and his movements are stiff when he is active. It seems that these problems are not only a quality problem, but also a training problem. With more practice, you can do well. practice makes perfect