🔢 MathGrade 4Lesson 29
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Read Maps and Grids
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Learning Objectives
- 1Read and write coordinate pairs on a grid
- 2Locate points on a grid using (x, y) coordinates
- 3Apply grid reading skills to maps and real-life situations
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Mini Lesson
A grid uses two lines called axes to help us locate any point. The horizontal line is the x-axis and the vertical line is the y-axis. Every point on a grid has an address called a coordinate pair.
What is a Coordinate Pair?
- A coordinate pair is written as (x, y) — two numbers inside brackets separated by a comma.
- The first number (x) tells you how far to go across (right along the x-axis).
- The second number (y) tells you how far to go up (along the y-axis).
- Always read x first, then y: "across, then up."
The Origin
- The origin is the point (0, 0) — where the x-axis and y-axis meet.
- Every coordinate pair is measured from the origin.
- Moving right from the origin increases x; moving up increases y.
Reading Maps and Grids
- Maps often label columns with numbers (or letters) and rows with numbers (or letters).
- Reading a map grid follows the same rule: find the column first, then the row.
- Example: column 3, row 2 is the same idea as the coordinate pair (3, 2).
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Tip: remember "across the hall, then up the stairs." Go along x first, then go up y.
Vocabulary
Grid
A pattern of equal squares formed by horizontal and vertical linese.g. I plot points on a grid.
Coordinate
A pair of numbers that names an exact spot on a gride.g. The coordinate (3, 2) is across 3 and up 2.
x-axis
The horizontal number line on a gride.g. I move along the x-axis first.
y-axis
The vertical number line on a gride.g. Then I move up the y-axis.
Origin
The point (0, 0) where the x-axis and y-axis meete.g. I start counting from the origin.
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