When I was just sensible, my mother not only taught me to read, but also pointed to the apples on my plate to let me count and let me know what numbers are. When I entered the first grade of primary school, my teacher taught me to calculate by addition and subtraction. I found mathematics so interesting.

Now in the fourth grade, I not only find mathematics interesting, but also find that mathematics can solve many problems in life.

One day, my father's friend Uncle Li came to my house. He said he wanted to test me. Let me guess how old his son is this year. Uncle Li said, "I am 33 years older than my son this year. Five years later, my age is four times that of my son. Guess how old my son is this year? "

"Your son is six years old," I blurted out. Uncle Li asked me in surprise, "How did you work it out?" I said, "According to the fact that you are 33 years older than your son this year and four times older than your son five years later, we can know that you are (4- 1=3) times older than your son five years later, and this three times is 33 years old. We can find out your son's age after five years from the age difference and the age multiple difference, so that we can find out your son's age this year. " Uncle Li repeatedly praised me for my cleverness.

Through this test, I understand that mathematics is used in many places in my life. As long as you observe carefully, mathematics is everywhere.