The pears and plums were bulging with little cheeks, and they silently put the last of the two plates on the chopsticks in their hands in front of her. Pen "Fun" Pavilion www.biquge.info

Her eyebrows were upside down, and she suddenly warmed up, and happily put the two into her mouth.

Mr. Wu looked at it and couldn't help laughing. However, Mr. Wu didn't say anything, but the strength of the chewing in his mouth was a little shallower. He had also come at home for breakfast, and he didn't want to rob them of too much breakfast.

The baby returned with a pen and paper, but saw that the calculation formula protected by Mr. Wu had been destroyed, and Mr. Wu also ate it, and stood in front of the four of them for a while.

She glanced at Pear and Plum warningly, then put down the dishes and chopsticks first, beckoned to the baby, and wrote down an example of the addition, subtraction, multiplication and division algorithm for the baby first. When it was written, the baby watched and held the pieces of paper tightly in her arms.

She said, "Baby, have you had breakfast, then you will go to the next room first and become proficient in addition, subtraction and multiplication." I'll teach you division when I'm done. ”

"Alas!" the baby replied, and ran away to the other side.

Mr. Wu always looked at it with a probing head, and at this time he also put down the dishes and chopsticks and chased after the baby.

She looked a little funny, and felt that this old Mr. Wu and Dr. Zhang had similar temperaments, they were both very good people, and when they met things they liked, they seemed to be a naughty child, and they didn't care about the eyes of others at all, showing their curiosity and eagerness to learn on their faces, and they seemed even more crazy. She knew that Dr. Zhang's medical skills were superb, and she thought that Mr. Wu's knowledge should indeed be a big one. The baby is a blessing.

She also underestimated herself and pears and plums. The breakfast that was full of them was actually eaten up in the end. It's just that they are too full after eating, and the three of them are all shy, a little lazy and don't want to move.

The baby and Mr. Wu seemed to have studied and understood the way of the algorithm of addition, subtraction and multiplication, and waited for her to not show up for a long time, eager to know the algorithm of division, so the two of them came over to urge together. When she looked at it, she always felt that Mr. Wu was more eager than the baby.

She told them to wait a moment, and cheered up, pacing around the room, intending to digest it. I saw that the room opposite was actually very small, with only a small square table, which was enough to make a simple study for the baby, which was not enough to accommodate so many of them. Thinking about it again, it seems that this private room is the only one in the whole shop that can welcome guests, and it is specially reserved for her. No matter how full the place is, it will not be used for anything else. Just wait for her to not know when she will come, and there will be a place at any time. Last time, she asked Brother Lu and Sister-in-law Lu to leave a place for her, and the two of them were really interested in leaving her an excellent one.

Anyway, for the sake of digestion, she felt that she still had to teach the baby in this room, so she began to arrange the plates on the table. The baby is well-behaved and immediately helps. When Lizi and Meizi saw that their young lady was doing it herself, they naturally immediately helped. And Mr. Wu was not idle, and also came to help.

The five of them quickly cleaned up the table. It was Pear and Meizi who helped the baby to send the empty dinner plate to the kitchen together, which inevitably attracted Brother Lu and Sister-in-law Lu.

As soon as the two of them came up, they were full of self-blame, and said: "Miss, have you eaten well? Is it enough? Why don't you call us up, how can there be any reason to ask the eldest lady to clean up herself." ”

She smiled and shook her head, "It's okay. It was also Brother Lu who made the breakfast so delicious, so much, we were all called to eat it all. I panicked, and I wanted to move. Now that the table is cleaned up, you should go about your work. I promised the baby that I would teach him division. And that taught him. I'll go back to you. By the way, it's okay anyway, you see what Pears and Plums can help, so let them stay down and help you. ”

The Lu couple glanced at each other, and there was nothing they could do with her, the amiable eldest lady, and after thanking them repeatedly, they both shook their heads.

When the baby returned, she and Mr. Wu sat down again. It's funny to say that Mr. Wu and Wa'er sat on either side of her, and they both looked like good students. recalled what Sister-in-law Lu said to Mr. Wu when she first came. She thought, could it be that Mr. Wu has come here to teach the baby in person recently, in fact, it is to wait until she may come back one day.

She couldn't help but ask, "Mr. Wu, did you come here to wait for me and want to meet me?"

Mr. Wu did not hide it, and said bluntly: "No. That day I wanted to teach the baby to count, but I didn't expect the baby to say that I don't need to teach him, and there is a more powerful sister Zhen'er to teach him. The old man was not convinced, but he saw that the ninety-nine multiplication table was indeed exquisite, but it was only a knowledge that could be used by hard reading. But the baby said that your real skills are more than that, and you can get the results of more complex arithmetic by heart, and you will teach him more when you come next time. The old man wants to come and listen to it, and see what else is more powerful about your little girl. The example of the addition, subtraction, and multiplication algorithm just now is really teachable. Zhen'er girl, you should tell me how to use this division equation. Just now, my baby and I watched it for a long time and didn't come up with a reason. It's just that the old decay took some time to calculate, and the results from above are indeed correct. But why is the result of this division different from the equation of addition, subtraction and multiplication, and the result is written above?"

She smiled, didn't say anything, and explained in detail to the two of them how to use the division equation.

"Wonderful, wonderful! "Although Mr. Wu is old, his brain is still flexible. She explained it again, and both Wa'er and Mr. Wu understood. Mr. Wu immediately sighed.

Mr. Wu was delighted, as if he had discovered a secret treasure, and tried a few examples with relish, only to feel that this algorithm was extremely easy to use, compared with what he had learned before, not only could he get the results faster, but also could be turned into ...... Why decimals.

For the example that the use of a single decimal place can further calculate the single place integer, Mr. Wu accepted that it was a little slower than the baby. Thinking of practical use, she taught the baby mainly to make the baby better for his father to read the accounts in the future, and she also taught the baby the rounding method. Mr. Wu also didn't understand when he heard it.

The way of arithmetic is to pursue precise results. The decimal is for the pursuit of accuracy, Mr. Wu is sluggish, and when there are some results that can never be removed, he must keep counting. Like she taught the baby, two or three more decimal places are enough, but Mr. Wu disagreed. When it comes to rounding, it is somewhat contrary to the pursuit of precise results, and Mr. Wu has difficulty understanding why he did this.

She explained: "I teach my baby to learn this, not for the sake of learning, but so that he can help his father and mother to take care of the accounts. In practical application, 100 coins for 1 silver, 100 silver for 100 gold. Therefore, when calculating the money or purchasing goods for the guest officer, as long as the hundreds are multiplied and superimposed, it is good to calculate how much the meal or that batch of goods is worth, and finally divide by the hundreds, leaving two decimal places, if necessary, it can be divided twice, and it is good to calculate how much gold and silver the result is, plus how much silver is left. There's no smaller currency than a penny, is it? Under normal circumstances, there should not have been a third place. But we can still make use of it. Think about it, if the diners were a family, one person should have paid. But if you come with three or five friends, you often ask one person to treat you. We do a small business, and most of the diners are ordinary people. Always ask one person to have a treat, and people should also calculate their wallets, so it is not good to come and visit often. But what if we could help to calculate the money, and make the three or five pay their own share evenly?"