Is it from Beijing Normal University? I studied in Beijing Normal University, so I'll write in Beijing Normal University! Diary 1: circle: I know how to find the circumference-area of a circle, and there are some formulas. I also learn to solve the knowledge about circles in my life. I have learned that a circle is a straight line with countless diameters and radii, and the distance at which the compasses diverge is the radius of the circle. Diary 2: percentage: percentage is difficult, but it is not difficult to find the trick. I have learned the relationship between decimals, fractions and percentages, how to find the percentage between two numbers, how much A is more or less than B, and I will also use some percentage knowledge to solve problems and equations in life. Diary 3: Ratio: This lesson has the simplification of ratio and the calculation of ratio. I also know that the ratio can be decimal and fractional, and what is the relationship between fractional and ratio. I also know that the latter term of the ratio cannot be zero, and the score can also represent the ratio. Diary 4: Numbers in life: There are many numbers in life, which also means that there is mathematics everywhere in life. I also learned to use pictures to show the relationship between family members. Diary 5: Sports and Mathematics: Mathematics is indispensable in sports, such as nutrition collocation, shaking hands among members, the number of races, knowledge in the track and so on. For example, the game time is a difficult problem to solve. It's very troublesome. You need to draw a picture or list, but it's easy to master the formula. Diary 6: the law in the pattern: a good pattern can form a beautiful pattern. It can get a flower by rotation and a pattern by translation, which is really beautiful. There is also symmetry, which can repeat many patterns, but in different directions. Diary 7: Summary: Mathematics is so interesting that we can't live without it everywhere. Even if you do manual work, you need math. If we learn math well, we will find many jobs in the future. Alas! I'm exhausted. I can't make up the eighth one. Write it yourself!