The problem of the tung tree made Wang Wei stunned. What is the use of learning mathematics? This benefit can be seen everywhere in life. Do you still need to ask?

But after thinking about it, Wang Wei explained: "Look, when we eat meat every day, we need to divide the barbecue into small portions, right? But the two cooks of the barbecue don't count, so there are extra barbecue every time. In this way, will the extra barbecue be wasted? If they can count, they will know how many people in our tribe are. Everyone roasts a portion of meat, so there will be no extra, so there will be no waste."

When Tongshu heard this, he felt that what Wang Wei said made sense. The two cooks should indeed learn to count.

Then, Wang Wei continued: "In addition to dividing meat, there are other uses for mathematics. For example, the stone axe production assembly line we formed. There are always many tribe members who tie the stone and the axe handle together, but there are always not enough people who chop the axe handle. In this way, the production speed of the stone axe will never be improved. If you learn mathematics, you can calculate based on everyone's work efficiency to arrange a few people who cut the axe handle, how many people who rub the straw ropes, and how many people who crush the stones need to arrange a few people, so that people can use the people most reasonably."

Wang Wei's example made Tongshu feel that he should learn to count.

After hesitating for a while, Tongshu spoke, "Then, after finishing the barbecue, let's start learning to count?"

"Well, not only do we have to learn, but even the tribe members have to learn. As long as they learn to count, how many stones and wood we need in the future, as long as they report a number to tell them, they will know how much they should do. As long as they learn to count, there are always many benefits." Wang Wei said.

Tongshu agreed and then buried his head in chewing the barbecue in his hand.

After eating the food, a crescent moon rose into the sky.

The bright moonlight shines brightly at night under the reflection of the snow.

The noisy inside the cave, on the one hand, is because today I harvest a lot of food and animal skins. The tribesmen are assigned tasks during the day, and only at night can they have time to celebrate each other.

On the other hand, it was because they heard that Wang Wei wanted to teach them to count at night.

They are still very curious about learning to count.

In fact, the clan members have already had the concept of numbers. Usually, everyone can understand the meaning of one or two numbers. After living for a long time, many people even know the three.

But most people don’t know what is behind the three.

Of course, for them, it doesn’t matter what comes after the third, after all, they can’t use it.

Today, Wang Wei wants to teach them the numbers behind the three, and they still feel quite novel.

Although the cave was noisy, there was no light at all.

Although the outside of the cave is bright, it is too cold.

Therefore, Wang Wei's wish to use charcoal as chalk and wall as blackboard in front of everyone was dashed.

"Everyone, calm down. I have discussed with the clan leader Tongshu. In the future, I will teach you to count before going to bed every day. There are more places to use numbers in the future. I hope everyone can learn it earlier." Wang Wei increased his voice and suppressed everyone's voice.

After the noisy sound in the cave gradually subsided, Wang Wei continued: "Today is the first day, let's learn something simple. Everyone follow me to read, one, two, three, four, five!"

There was silence in the cave. After a while, the sound of the tung tree sounded first: "One, two, three, four, four..."

After a long time, I didn’t read the last five words.

Just as everyone was anxious, a somewhat tender voice sounded in the corner of the cave: "Five!"

"Yes, it's very good. The next four is five. Come on, everyone will read it with me again, one, two, three, four, five!" Wang Wei praised.

This time, more people made a sound and read these five numbers together.

These five numbers do not have tone conflicts when read, and are considered a very easy sentence.

After repeating it four or five times, everyone started to read it easily.

After everyone read it smoothly, Wang Wei said again: "Actually, these five numbers are very magical numbers, because there are many things on us that are related to five. If you don't believe it, count them by hand. You have five fingers on your left hand and five fingers on your right hand. Each of these five fingers represents a number."

What Wang Wei said seems to be a piece of nonsense, but in fact it is deepening the meaning of everyone and showing everyone more intuitively what the numbers represent.

It's like you talked to an ancient man about the airplane. He learned the word "air" but he didn't know what an airplane is. Only after seeing the airplane with his own eyes will he understand, oh, it turns out that this is an airplane!

The same is true for numbers. For the first time, you will not be able to understand the meaning of numbers other than three. But if you memorize them carefully, you will soon understand the meaning of them.

The clans did not know nothing about numbers, but knew about one, two, and three.

When they count the first three fingers, they naturally understand what it means. When they break open the fourth finger and count to four, they will vaguely understand in their hearts that four means one more than three.

Of course, this level of enlightenment is only subconscious and not too clear, but it doesn't matter.

After counting the fingers of the left hand, Wang Wei asked them to count the right hand again.

After counting the right hand, there will be the left foot and the right foot.

If it was during the day, Wang Wei could still use common things like stones, wood, even animal skins, straw sandals to deepen the impression of the tribe again and again.

Let everyone gradually understand the meaning of 45 and 60, 80, 90, 90, 90.

When everyone held their fingers and toes and understood the meaning of the five numbers, Wang Wei spoke again.

"Everyone counts fingers and toes and grows on their bodies. It's not challenging. Let me give you a more difficult question. I'll call you a few more times. You count them and I'll call you a few times in total. Oh, oh, oh!" Wang Wei said.

After calling, the cave was silent for a while, then Tongshu took the lead and said, "Call three times?"

"Smart! So awesome. You are the first to count correctly. It's so awesome!" Wang Wei encouraged.

After hearing Wang Wei's encouragement, a tribe member said unconvincedly: "Actually, I just counted three times, but Tongshu said first. I am as powerful as him!"

"Haha, then why don't you say it first? If you say it first, you will be better than him. Now that people say it, you are not as good as him! I will call you again. If you are not convinced, count it and see if I call you a few times." Wang Wei said.

After hearing Wang Wei's words, the tribe members who thought they had mastered five numbers were ready to answer the questions later and wanted to be the most powerful one.

Wang Wei cleared his throat and started screaming.

"Yeah, hahahaha!" Wang Wei shouted word by word.

The tribe members who were ready to show their skills were stuck in an instant, as if something was blocking their chests and couldn't speak.

"Okay, I'm done calling. Does anyone know how many times did Yingying and Hahaha call each other?" Wang Wei asked.

Silence, there is silence in the cave.

You are so unreasonable that you just called one voice, but now you actually called two voices. Who can remember this difficult? It's so shameless.

Just as everyone was silent, the tender voice that reminded Tongshu of "Five" sounded timidly again.

"The whimpering sound was yelling all over the place, and the whimpering sound was yelling five times."

"Very good! Great, the answer is completely correct! What's your name? It's so amazing. No one else counts clearly, and you just count it. It's really amazing!" Wang Wei praised without hesitation.

"I, I haven't grown up yet and have no name, but I'm black. Everyone calls me Heizi now." Heizi said excitedly when he was praised by Wang Wei.

Wang Wei has been in this tribe for so long, so he naturally knows that people who have not yet grown up usually do not have official names.

However, in tribes, people don’t have much concept of numbers, and adulthood is usually determined by size and strength.

Wang Wei, a tribe named Heizi, is quite impressed. He is thin and looks very clever.

A few days ago, after Wang Wei weaved straw sandals, he also learned to tie a lot of sword thatch on his feet.

Although this is not very useful, it at least shows that he is good at thinking and imitating.

Wang Wei laughed and said, "Very good, Heizi, you are the only one who counts my voice just now, so I decided to give you a reward. Should you choose to let the tung tree name you or choose to have a pair of straw sandals?"

When Heizi heard this, he suddenly became excited and shouted: "I want grass... no, I want a name!"

The answer was beyond Wang Wei's expectations. He asked curiously: "The feet will not be cold when you put on straw sandals. Why don't you have straw sandals?"

Kuroko replied: "Because you have a name, you will be an adult. Adult men in our tribe all have animal leather jackets and straw sandals. If I had a name, even if I didn't have animal leather jackets, I would have straw sandals."

When Wang Wei heard this, he was a little surprised that Heizi could think of this layer, and then smiled and said, "Since you want a name, let Tongshu give you a name."
Chapter completed!