So many secrets are hidden in mathematics!
It turns out that when you master the budget law, arithmetic becomes so simple!
In a relaxed environment, learn knowledge by playing math games, so that math is no longer boring. We can think more vividly and operate more quickly, which makes us understand a truth. Many examples closely related to life make children understand that mathematics is really useful!
This book is rich in content, there are many knowledge points that the teacher did not talk about, and there are also knowledge points that the teacher talked about. What impressed us the most was the village of honesty and the village of lies, which is a paradox:
Where are the villages of honesty and lies?
Fold it into a question: which direction is Honest Village?
If telling the truth and lying must have the same answer.
Which direction is your village?
If you are an honest village, you will point to the room in the honest village. If you are a village of lies, you should point to the village of honesty, because you want to talk. )
I'm really surprised after reading this. It turns out that mathematics has so many mysteries!
Another thing that impressed me deeply: change fraud.
I didn't understand it at first, but I read it several times before I understood the mystery!
For example, a person buys a piece of chewing gum of 100 yen, and takes out a note of 5000 yen when paying. When the cashier puts the change of 4900 yen in the cashier's desk, he puts 900 yen and chewing gum in his pocket, and then there is only 4000 yen left in the cashier's desk. The 5000 yen in his hand, plus the 4000 yen on the stage, and then he took out 1000 yen, which was exactly 10000 yen, so he said to the cashier, can I change a whole 10000 yen? Then the money will be there.
I really admire you.
After reading this book, I also learned a lot of knowledge points, complex problems became simple, logical thinking became stronger, and mathematics was really interesting! ! !