Mathematics Geometry Conceptual 10–11 yrs

Numbers on a number line

数轴上的数

Description

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

Mastery Evidence

✓ 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

Assessment Prompt

If your child 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?