There is mathematics everywhere in life, which plays an important role in life. Mathematics is needed everywhere in life because it can solve many problems in life. My sister used it on her birthday. At noon on Sunday, my sister celebrated her tenth birthday and came to the hotel. I saw a lot of people. She invited six classmates, one sister and one brother, plus me and ten people. Ten of us were alone in a private room, and the cake came. My sister doesn't know how to divide it fairly, because she is worried that if there are too many people and too few people, everyone will be angry.

At this time, I proposed: "We divide this cake into ten parts on average, and each person's cake share accounts for one tenth of the total cake, which is only fair."

"Yes, but what if one tenth of each person is not enough to eat?"

"Then use another method. Everyone cuts as much as possible according to their own appetite, so that no one will have any objection."

In this way, we shared the cake. We ate the cake and were very happy. The birthday party soon ended and everyone went home happily.

Birthday parties let me know how important math is. Only by learning math well can I show myself in front of others.