Chapter 106

I have some basic judgments about Liang Chengcai's situation in my heart.

"Very good, your foundation is good. Then we can learn vertical poses today."

Then, Lin Xiaoyue gave Liang Chengcai the vertical method of addition and subtraction.

Liang Chengcai was very surprised. He didn't expect to be able to calculate the result of adding or subtracting two large numbers so quickly without using an abacus.

"Well, now that you have learned both addition and subtraction, let's learn mixed addition and subtraction. The use of parentheses and simple algorithms."

Lin Xiaoyue wrote a formula and began to talk about calculation methods and the use of parentheses.

Liang Chengcai was surprised again.

"The emergence of mixed addition and subtraction allows us to use a simple method to sum or difference." Lin Xiaoyue said.

"For example, in this question 123 minus 99, it will be more complicated to directly list the vertical format. We can turn 99 into parentheses 100 minus 1. Then open the parentheses, and change the whole formula into 123 minus 100 plus 1, and then do not use the vertical format. A quick answer to this question is 24."

Liang Chengcai's eyes gleamed brightly.

"It's wonderful!" exclaimed.

Lin Xiaoyue felt a little proud in her heart. Thinking about where this is going.

"Another example is 38 plus 54 plus 22, because 8 and 2 can make up 10, you can put 22 in the front and add 38 to get 60, and then add 60 to 54 to equal 114."

"Yes!" Liang Chengcai looked at the formula written by Lin Xiaoyue and admired it.

Lin Xiaoyue saw that Liang Chengcai had almost mastered it, so she took out the exercises she had prepared in advance.

"I'm afraid you won't be able to absorb it if you talk too much in one day. That's it for today. These are today's homework, you can copy them and do them well. I'll check them before class tomorrow."

"Yes!" Liang Chengcai hurriedly saluted Lin Xiaoyue, almost treating Lin Xiaoyue as a gentleman of the academy.

Lin Xiaoyue's heart moved.

"Also, I'll leave you with another question."

"Miss Lin, please speak." Liang Chengcai still bowed.

"Calculate how much is equal to adding 1 to 100." Tomorrow, she will talk about multiplication. She will wait until she finishes explaining the simple operation of multiplication before letting Liang Chengcai calculate it by herself.

Liang Chengcai was startled.

"Yes." Then he responded.

"Also, starting tomorrow, I will come to give you a lecture after three quarters in the morning, and each lecture will last for up to one hour." Lin Xiaoyue said again.