Grid coordinates and lattice reasoning

Points on a grid can be named by how far across and how far up they sit. Once positions have numbers, distance, direction and repetition become arithmetic. Most grid problems are really about the difference between counting lines and counting spaces.

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Work through it

LearnWhat it is, how to spot it, a worked example, and where it goes wrong.
Practice — 3-point ladder2 problems. Three in a row finishes it.0/3 in a row · 0/2 solved
Practice — 4-point ladder1 problem. Three in a row finishes it.0/3 in a row · 0/1 solved
Practice — 5-point ladder2 problems. Three in a row finishes it.0/3 in a row · 0/2 solved
Skill quizFinish every ladder that has problems first.Finish the ladders above first

Before and after

Needs first

Nothing. This is one of the skills the Atlas starts from.

Opens up

CNT-07Counting paths on a grid CNT-12Counting by position (sliding window)LOG-07Coloring arguments PAT-06Patterns in tables and grids

In official papers

No indexed official paper question has been tagged with GEO-02 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.

See the papers indexed so far

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