数轴上的数
Numbers on a number line
理解由两条互相垂直的数轴（坐标轴）构成的坐标系，原点为 (0,0)；知道有序数对 (x, y) 表示一个唯一确定的点，其中第一个数表示该点到原点的水平距离，第二个数表示垂直距离。
Understand a coordinate system defined by two perpendicular number lines (axes) with an origin at (0,0); know that an ordered pair (x, y) specifies a unique point where the first number gives horizontal distance and the second gives vertical distance from the origin
学习证据 / Evidence
- 在坐标网格上识别x轴、y轴和原点
- 解释 (3, 5) 表示沿着x轴向右移动3个单位，再沿着y轴向上移动5个单位
- 通过解释每个坐标的含义来区分 (2, 4) 和 (4, 2)
- Identify the x-axis, y-axis, and origin on a coordinate grid
- Explain that (3, 5) means go 3 along the x-axis and 5 up the y-axis
- Distinguish (2, 4) from (4, 2) by explaining each coordinate's meaning
评估问题 / Assessment
如果{{name}}看着一张带网格的地图，当你把某个位置描述为“从原点向右3格、向上5格”时，他/她能找到准确的那个点，并解释这两个数分别表示什么吗？
If {{name}} looks at a map with a grid and you describe a location as "3 across and 5 up from the origin", can they find the exact point — and explain what each of the two numbers tells you?