Bear doesn't like studying, but just wants to do business, so he opened a fruit shop next to the school. Rabbit and monkey are his classmates. They have agreed to teach this lazy guy who doesn't like school.

They came to bear's fruit shop.

"How much are the peaches?" Asked the little monkey.

"The first basket is 6 yuan and 3 Jin, and the second basket is 6 yuan and 2 Jin." The bear replied.

The little monkey said, "If I take 5 kilograms from two baskets, I will pay you 12 yuan, right?"

The bear nodded.

"That I want it all. Since 5 kg is 12 yuan, then 60 kg is 12× 12= 144 yuan, right? "

"Exactly, exactly." Said the bear.

So the little monkey bought all the peaches, paid the money and left happily with the little rabbit.

When I get home at night, the bear pays the bill, which is a loss anyway. The next day, the little monkey and the little rabbit found the little bear and told him the situation. They smiled and said, "It's all because you don't study well that we came to teach you a lesson." They replenished the little money to the bear.

Bear hung his head in shame, and since then, he has been very serious in class every day. The three of them became good friends.

The origin of * * * numbers

Xiaoming is a child who likes to ask questions. One day, he became interested in the numbers 0-9: Why is it called "* * * numbers"? So he went to ask his mother: "Since 0-9 is called' * * * number', it must have been invented by * * * people, mom?"

Mom shook her head and said, "* * * Numbers were actually invented by Indians. About 1500 years ago, Indians used a special word to represent numbers. There are 10 words, and you can write both strokes. Later, these figures were introduced into * * *. * * * people think these numbers are simple and practical, so they are widely used in their own countries and spread to Europe. In this way, it gradually became the number we use today. Because * * * people have played a great role in the spread of these numbers, people are used to calling them' * * * numbers'. "

Xiao Ming heard this and said, "So that's it. Mom, can this be called' making a mistake'? " Mom smiled.

Children's song competition

The animal school held a children's song competition, with the elephant teacher as the referee.

The little monkey raised his hand first and began to recite: "I can calculate carry addition, and the digits can only be added if they are aligned." The number of digits should be aligned with the number of digits. When the number of digits exceeds ten, the number of digits should be advanced to ten. Add ten and one to count quickly and accurately. "

As soon as the little monkey finished speaking, the puppy began to recite again: "abdication and subtraction are not difficult, just align the numbers." If the single digits are small enough, ten people can borrow one. If ten people return, one will be ten, and if they return, one will be missing. How to reduce ten digits, ten digits will be reduced again and again. "

Everyone applauded their wonderful performance. Teacher Elephant said, "Their nursery rhymes make us understand that both carry addition and abdication subtraction should win the championship, ok?" Everyone agrees and applauds them.

mathematics