小学数学百科英语
数学基础概念
数字
Numbers
| 数字 | 英文 |
|---|---|
| 1 | one |
| 2 | two |
| 3 | three |
| 4 | four |
| 5 | five |
| 6 | six |
| 7 | seven |
| 8 | eight |
| 9 | nine |
| 10 | ten |
运算符
Operators
| 运算符 | 英文 |
|---|---|
| 加法 | plus |
| 减法 | minus |
| 乘法 | multiply |
| 除法 | divide |
算术表达式
Arithmetic expressions
- 1 + 2 = 3
- 5 3 = 2
- 4 × 2 = 8
- 8 ÷ 2 = 4
几何图形
线段
Line segment
- A line segment is a part of a line that has two endpoints.
直线
Line
- A line is a straight path that extends forever in both directions.
射线
Ray
- A ray is a part of a line that has one endpoint and extends forever in one direction.
平面
Plane
- A plane is a flat surface that extends forever in all directions.
三角形
Triangle
- A triangle is a polygon with three sides and three angles.
四边形
Quadrilateral
- A quadrilateral is a polygon with four sides and four angles.
分数
分数表示法
Fraction notation
- A fraction is a number that represents part of a whole.
| 分数 | 英文 |
|---|---|
| 1/2 | one half |
| 1/4 | one quarter |
| 3/4 | three quarters |
分数运算
Fraction operations
- Addition: 1/2 + 1/4 = 3/4
- Subtraction: 3/4 1/4 = 1/2
- Multiplication: 1/2 × 1/4 = 1/8
- Division: 1/2 ÷ 1/4 = 2
比例与比例尺
比例
Ratio
- A ratio is a comparison of two quantities by division.
比例尺
Scale
- A scale is a ratio that compares a distance on a map to the actual distance.
FAQs
问题：如何用英语表达“3乘以4等于12”？
解答：3 multiplied by 4 equals 12.
问题：如何用英语表达“一个正方形的四个角都是直角”？
解答：All four angles of a square are right angles.
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