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Xiao Ming asked: Why are the wheels round? Xiaoqiang drew a circle with a compass and said:

We measure the distance from any point on the circumference to the center of the circle, and find that they are all equal, which is called the radius. The wheel is round, the axle is installed in the center of the circle, and the distance between the axle and the ground is always equal to the radius of the wheel, so that the wheel can roll smoothly on the ground. If the wheels are square or triangular in shape, and the distance from the rim to the center of the circle is unequal, the car will vibrate up and down when it walks.

Therefore, the wheels are all round. After finishing speaking, Xiao Ming understood, and he said with deep feelings: "It seems that mathematics is inseparable everywhere!" ”

Math Stories Go to the Supermarket

One morning, me, my mother, and my father all got up, but my sister didn't get up yet. We finished eating, but my sister hadn't gotten up yet. So, we decided to go to the supermarket first.

Then we went to the supermarket, which was so lively! We bought ice cream, bread. A loaf of bread is 2 yuan, we bought 4 pieces, a total of 2 4 = 8 yuan; Ice cream is 3 yuan, we bought 6 pieces, and the ice cream cost 3 6 = 18 yuan.

It cost a total of 8 + 18 = 26 yuan. Mom gave the cashier aunt 50 yuan, recovered 24 yuan, and we went home.

Math Story: Candy

Today, the weather is sunny.

My sister asked, "What are we going to do?" I said

We can take the candy out and separate it. We said just do it, took out 20 pieces of candy, and my sister said, "Let's have one each."

I said, "No, because 10 2 = 20, so we have 10 each." ”

We separated the candies and packed them into different boxes.

Math Story: Watching TV

Today, the sky is hot.

Mom said, "You guys write a math story by yourself, right?" I said, "Yes!" My sister also said, "Yes! Then the mother said, "Each of you will watch an episode of TV and see who writes well." ”

I watched "Balala Little Demon Fairy", and so did my sister. Each episode is 10 minutes and 600 seconds. Mom said, "How long is 2 episodes?" I said, "10 + 10 = 20 minutes, 1200 seconds."

Fishing for Math Stories

It's the weekend again, and my mom takes me fishing (we're going to fish for fake fish).

We came to Redstone Park to fish for fake fish. The fishing stall is located on the east side of Redstone Park, and the fishing pond is actually an inflatable pool with all kinds of plastic fish, ducklings, octopuses, dolphins, and other ......, the rod is also plastic'There is a suction ball hanging under the fishing line, and a nail is smashed in the fish's mouth, so that the fish can be lured to the bait.

My sister said curiously, "Who can finish catching such a big pond of fish?" Besides, where do you put it?

My mother gave each of us two yuan and five yuan, a total of five yuan, and my sister and I took a fishing rod and started fishing. However, the fish are all sinking to the bottom of the water, but the angry thing is that the iron ball does not sink alive or dead, what should I do? So, I pressed the suction ball down with one hand and the fishing rod in the other, and just like that, we quickly caught dolphins, octopuses, tropical fish, goldfish, etc.

Later, two more little brothers came. One of the younger brothers fished very fast, but he didn't catch a single dolphin. I gave him 4, and now I only have 8 left.

Guess what, how many dolphins do I have? Surely you guessed it, right? It's 12, and the equation is:

4+8=12 (only).

We played for about an hour and then went home.

The story of Gauss as a child.

When Gauss was ten years old, his elementary school teacher had an arithmetic problem: "Calculate 1 2 3....＋100＝？This is difficult for a beginner arithmetic student, but Gauss solved the answer in a few seconds, using the symmetry of arithmetic series (difference series) and then putting together pairs of numbers in the same way as the process of finding the sum of ordinary arithmetic series:

1＋100，2＋ 99，3＋98，……49 52, 50 51 And there are 50 sets of such combinations, so the answer can be quickly found as: 101 50 5050

But it looks good, and the Mekong River is odd and even