Keywords: 500 words in the fifth grade of mathematics primary school

Words: 500 words composition

This article is suitable for: the fifth grade of primary school.

Composition source:

This composition is a 500-word composition about the fifth grade of primary school. The topic is "Mathematical Thesis". Everyone is welcome to contribute enthusiastically. One day when I was reading the Olympic Mathematical Books at home, I saw such a question: A big rectangle is composed of six small squares in length and four small squares in width. How many squares are there in this picture? I read the previous example and found a way to understand it at once. We can first assume that the side length of each small square is 1, and then divide the side length into 1, 2, 3, 4, 5, etc. by classification, and calculate the number of each square separately, and then add up to the answer. Take this problem as an example. There are 4×6=24 squares with a side length of 1, 3×5= 15 squares with a side length of 2, 2×4=8 squares with a side length of 3 and 1×3=3 squares with a side length of 4. Because the width is 4, through this problem, I found the law to solve this kind of problem, and I can also do similar problems of calculating rectangles. So I'm not afraid of this kind of problem anymore. Teacher's comment: If you can find a pattern from a question type and form your own pattern, then you don't have to be afraid of this question type. This paper introduces a problem of calculating the number of rectangles, and explains the solution of this kind of problem in detail. Fluent language and clear description. I believe that children with similar questions will find a way. If this is a paper, then the young author has probably mastered the basic writing methods of the paper. However, the author should pay attention to the fact that the paper is usually an article expressing his own views, and he should extract his own views concisely. (China famous teacher: Teacher Xu) 2009-2-19 22:16: 00.