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First Quadrant Coordinates

CONCEPTUAL
Mathematics›Geometry|Ages 8—9|ID: mt_jBQS-CicNn

Describe positions on a 2-D grid as coordinates in the first quadrant

Mastery Evidence

  • Read the coordinates of a point on a grid as (3, 5)
  • Explain that the first number is the horizontal distance and the second is the vertical distance
  • Identify the coordinates of all vertices of a shape plotted on a grid

Assessment Prompt

“If [child] is playing a grid-based treasure map game, can they correctly say where the treasure is using two numbers — like "three across and four up" — from the corner?”

Prerequisites1

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  • Position, direction, and movement soft

    Position/direction vocabulary supports understanding coordinate grid

    • Positional Language hard

      Position/direction vocabulary with right angles extends basic positional language

    • Turns & Directions hard

      Right-angle turns (clockwise/anti-clockwise) build directly on whole/half/quarter turns from Year 1

      • What Is a Half? soft

        Understanding half and quarter turns benefits from the concept of halves and quarters

        • Division as equal sharing hard

          Finding a half requires equal sharing into 2 groups — a division concept

          • Subtraction as taking away or separating hard

            Division as equal sharing/grouping requires understanding subtraction as taking away/separating

            • How Many in Total? hard

              Understanding subtraction as taking away requires knowing numbers represent quantities (cardinality)

              • One-to-one counting hard

                Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'

      • Positional Language hard

        Describing movement and turns builds on positional language

Unlocks3