Chapter 499 479 Learning Arithmetic (3)
Si Ye gave an example, "Let's say there are two people in the cave now. If I'm not here, then one person will be gone, leaving only one."
"Not bad, you can solve word problems right away?" Xia Tian gave him an affirmative look. "You're right. To express changes in quantity, we can indeed use addition and subtraction. But besides that, we can also calculate the difference."
"What does the difference mean?" Si Ye asked without understanding.
He heard many unfamiliar words from the girl's mouth, and he could vaguely guess the meaning of them, but he couldn't be sure.
Fortunately, Xia Tian was also very patient in explaining. "The meaning of this concept is also very easy to understand. Let me give you an example. For example, there are only two of us living in our family, but there is only Aqiu's sister at home. Does that mean our family has one more person than hers? If you add them up, there are three people in our two families. In layman's terms, which one has more and which one has less? How much more, how much less."
"I see. Actually, this is used for comparison." Si Ye nodded honestly. "I understand. You're right. This tool is very useful, and there's no limit on the size of the numbers. If Beast City... oh no, even if it's the tribe, if there was a set of methods for recording and comparing, it would save a lot of energy in daily life. Can you teach me how to use this addition and subtraction?"
"Don't worry, let's master addition and subtraction within ten first. We can slowly learn larger numbers later. Don't worry." Xia Tian comforted him and started adding and subtracting within ten. "The knowledge point is very simple. The basic rule is..."
It didn't take her too long to explain the rules of addition and subtraction clearly.
"The remaining time..." Xia Tian glanced at the sky outside. There were no windows in the cave, and the animal skins hanging on the curtain at the door still let in a little light, but now there was absolutely no light at all.
She said, "It's getting late now, so today's lesson ends here. Tomorrow we'll do some more practice to consolidate our knowledge, and that'll be all. If there are no problems, we'll continue learning operations with larger numbers tomorrow. The rules are the same, but because the numbers are larger, it will be more complicated. Don't worry, as long as you study hard and practice diligently, you'll have no problems."
"Okay, I believe you." Si Ye replied.
Next, for several days, they stayed in the cave, lying on the earthen kang, learning and practicing addition and subtraction of numbers.
The winter season passed without a trace. After a week, Si Ye could already skillfully perform addition and subtraction within one thousand, and was planning to start learning multiplication and division.
Xia Tian's wool pen is also ready. Although there is no paper and ink yet, she can write well by just dipping it in water and writing on the slate.
At this time, the continuous snowing stopped.
The gloomy sky outside was dispelled by the sunshine, and the sunlight like broken gold sprinkled through the clouds. Although it did not change the temperature of the air, even just looking at the sunny sky would make one feel much more open-minded.
"The weather is nice today. Let's go out and get some fresh air while it's still warm. It's not comfortable to stay cooped up at home all the time." Xia Tian suggested this after putting on all the thickest fur clothes she could wear.
(End of this chapter)
Continue read on readnovelmtl.com
