Online games: I really don’t want to have unlimited fusion

Chapter 663 This method is incredible!

"This method, I call it 'vertical arithmetic'’！"

Su Chen looked at each student and said, and soon he wrote the two formulas 1+1=2 and 5+5=10 on the door panel and said:

"These two addition operations are very simple. Generally, older students can calculate them verbally, but what if it is a slightly larger number like 23+46?"

"People with a weak foundation in mathematics may find it difficult to calculate it in a short time, and those who have never studied mathematics may not even be able to calculate it at all!"

Su Chen said something and clicked the pointer on his hand. This feeling is awesome!

"If I make this number larger and change it to 2356+4678, can you do the math orally? Even if you have an abacus, you still need some time."

Su Chen not only looked at the students below, but also scanned the surrounding adults.

In Su Chen's memory, the people in Sujiazhai had very poor mathematical knowledge. Those who were less than ten counted with their fingers, and those who were greater than ten were counted with their fingers. I can't borrow other people's fingers to calculate, but I can't borrow any bigger fingers. I can't calculate no matter how

I do it, so I can only ask Su Shunsheng to make an abacus. This is the case in Sujiazhai, and it's not much better in other places.

At this time, Su Shunsheng smiled. He looked at Su Chen to see what kind of treasure this boy was going to offer.

"Look at me!"

Su Chen turned around and wrote 2356+4678 in the vertical format on the door panel. 6+8 was written with 4 in digits, 5+7 was written with 2 in digits...

7034!

In just a few breaths, Su Chen turned everyone around. A large number that I have never encountered is calculated!

This is an extremely simple thing for modern people, but it was a big rarity for the bandits in Sujiazhai in the Ming Dynasty!

Su Shunsheng frowned and said:" At this speed, even my abacus is just like this... This method is incredible……"

Successfully arousing everyone's desire to learn, Su Chen smiled and took the trouble to teach everyone the method of vertical calculation over and over again.

Looking at the attitude of everyone listening very seriously, this is nothing more than the joy of teaching and educating people.

After two more days like this, the sand by the river was sifted with a large bamboo sieve set up diagonally, and the simple bamboo gear matching the water wheel shaft was also completed.

The two pieces of cement next to the stream were almost dry and became hard when smashed.

Cement with plaster of paris and cement with raw gypsum dry out to about the same hardness.

You know, the cement with plaster of paris was made one day later than the cement with plaster of paris.

This made Su Chen discover the benefits of plaster of paris.

It turns out that plaster of paris is used to speed up the setting of cement!

This discovery made Su Chen a little excited. Then he thought, the discarded clay might also be of great use, otherwise modern cement would not add this material for no reason.

But now, due to backward production conditions, it cannot be realized.

Now that the cement, sand, gravel, water wheel, etc. are all ready, it's time to start building the water turbine!

After firing and mixing enough cement, transporting enough river sand and gravel, and putting the bamboo turbine base aside, a few teenagers started working hard!

Wugong Mountain is located in the south of the Yangtze River and west of Poyang Lake. It is still very cold in the mountains in early spring, but Su Chen and the others were working enthusiastically, and they took off their rustic cotton clothes and threw them aside.

"Hey hey hey!"

Young men, you mix the concrete with a shovel and a hoe.

When they were almost done, Su Chen gave an order, and baskets of concrete were poured into the foundation pit, while raking the concrete in the pit evenly.