Rule number one,

My father and I went shopping in South Street. At 8 o'clock in the morning, we arrived at South Street by bus. There happened to be an old man beside the platform, and there was a talking scale beside him. Seeing me coming, grandpa smiled and said, "Little friend, do you weigh yourself?" I asked a little curiously, "How much does it cost to weigh it once?" Grandpa replied cheerfully: "You can only weigh 1 yuan at a time, and you can also measure your birth height!" I thought to myself: this is really killing two birds with one stone! So I stood firm on the scale.

Grandpa turned on the switch and only felt something soft touch my head. Then, a small rectangular note is printed on the machine, which reads: "Weight: 27.0 kg, height 132.5 cm"! This half year is 4 cm taller, but what about the weight? At this time, I remembered that the math teacher said, "There is another name called kilogram. I didn't expect to meet it today, and I know that my weight has increased by 2 kilograms! "

I was so happy on the way back! I must exercise my body!

Rule number two,

Today, grandma and I are going to make wonton. My grandmother went to the market to buy meat and vegetables and came back to chop them into wonton stuffing. Next, we are short of wonton skin. Grandma looked at the stuffing. I guess I'll buy wonton skins from 3 yuan. Grandma gave me 5 yuan to buy 3 pieces of wonton skin from Qian Qi. As I walked, I thought 5-3=2 yuan. After buying wonton skin, I should pay 2 yuan more. However, my aunt forgot to give me change.

I said to my aunt, "auntie, I bought wonton skin with 3 yuan, and I gave you 5 yuan." You should call me 2 yuan. Aunt said, "Sorry, little friend, I forgot. Here is your change. "I bought wonton skin and went home happily. Grandma and I started making wonton. After wrapping wonton, grandma asked me to count how many I wrapped. I found that there were nine in each row and only four in the next row.

I thought about it. In math class, the teacher taught us to multiply, add and subtract, so I didn't have to count. Our multiplication and division method is 7x9+4=67 (unit), and our multiplication and division method is 8x9-5=67 (unit). I found that there is mathematics everywhere in my life.