Math diary 300 words 1 Mathematics is everywhere, and there are many kinds of mathematics around him. Mathematics is essential, otherwise it will bring all kinds of inconvenience to life. Let's look for mathematics and explore mathematics together.
"Circle", we can see it everywhere. Isn't the bottom of the moon cake box, tea pot and medicine box round? But they are called cylinders as a whole. Pick up these cylinders and you may think, why do you want to make the bottom round? Why not make it rectangular or square? I have questioned it before, and now I can help you solve it!
When you make a cuboid, a cube and a cylinder from the same material, you can calculate the volume. This is what we will find: the volume of a cylinder is the largest, the volume of a cube is the second, and the volume of a cuboid is the smallest. At this time, I realized that in order to save materials, I made these boxes round, which also expanded the volume.
This is the advantage of the column.
Today, my father and I went to the bookstore to buy books.
We came to the bookstore. I picked out a long-awaited book and went to the cashier. Dad said, "Your book 12.6 yuan, my book 16.3 yuan, I took three ballpoint pens, 1.5 yuan. How much is left in 50 yuan? If you guess right, the rest of the money can buy you ice cream. " I think: 50 minus 12.6 plus 16.3 plus 1.5 times 3 equals 16.6 yuan. I said, "16.6 yuan." "Well, this 16.6 yuan can buy you an ice cream." Dad said happily
When I arrived at the ice cream shop, my father asked me again, "I bought two ice creams with 1.5 yuan and paid 16.6 yuan. How much is left? " I think: simple, 16.6 minus 1.5 times 2 equals 13.6 yuan. I said, "There is 13.6 yuan left." Dad said, "Not bad! Not bad. " I said angrily, "You underestimate me. This is a topic for two years. If I can't even know these, am I still a fifth-grade student? "
Mathematics is inseparable from life.