During the National Day holiday, my mother and I went shopping in the supermarket to find kilograms and grams. Walking into the supermarket, we first came to the biscuit cabinet. Among so many dazzling cookies, I chose my favorite casual cookie. I looked at it carefully and finally found the "net content100g" in the corner, indicating that the weight of this packet of biscuits excluding the bag is100g. If there is100g,

Then we went to the place where we bought rice. I found that a bag of rice costs 10 kg. If our family eats 2 kilograms a day, our family will eat 60 kilograms a month, which is six bags of rice.

Later, I saw 16 eggs, about 1 kg, a pineapple about 2 kg and a watermelon about 3 kg.

Today, I have gained a lot. I feel the knowledge of kilograms and grams in mathematics. Mathematics is really important in life.

2.& lt a little math misunderstanding >

Many people think that Arabic numerals were invented by Arabs, but I have always been skeptical about him. As I expected, today the math teacher introduced the real origin of Arabic numerals. It turned out to be a misunderstanding! The real inventors of Arabic numerals were Indians, because the navigation industry of Arabs was very developed at that time, and they spread the numerals from India to Arabia. Europeans learned this simple counting method from books and thought it was invented by them, so they called it Arabic numerals. Later, this misunderstanding spread to China.

Finally, I really want to say to Indians, "Thank you for bringing us so much convenience. Because of this, I like math very much. Not only the digital kingdom is magical, but also the knowledge of mathematical history is very rich.

The interesting life of mathematicians. In Wang Yuan, people who buy melons are dumbfounded. In summer, there is always a big watermelon stall at the entrance of Building 82 in Zhongguancun. The stall owner is Wei. Watermelon doesn't need to be knocked, you can stick it on your ear and listen. This is a shoo-in. Once, mathematicians Wang Yuan and his wife went to buy melons, and they calculated the price while selecting them. Watermelons sold in Lao Wei are not weighed, but sold as small melons, with 3 large melons and 0 small melons 1 piece. Mr Wang Yuan said, "Let's buy a big one. The big one is worth more than the small one. " Mrs. Wang picked two big melons, paid the money, and seemed hesitant when she saw that everyone else was robbing the small melons. Seeing her hesitation, Mr. Wang smiled and said, "What melon did you eat? Eat volume, not area. The radius of that small melon is slightly weaker than 2/3 of that of the big melon, but its volume is calculated in cubic. The small volume is less than 30% of the big one, of course, buying a big one will earn. " Mrs. Wang shook her head: "You have miscalculated. Large watermelon skin is thick, while small watermelon skin is thin. If you calculate the volume, I am afraid that it will still be a big loss. " Mr. Wang nodded and said, "Hey, don't forget that the skin of a small watermelon is three melons, and the big watermelon is only 1. If you have more skin, you can calculate the surface area again. " Finally, two people carried the big watermelon home, leaving Lao Wei stunned.