Bar models for part–whole

Drawing quantities as bars makes part and whole relationships visible without algebra. Equal parts get equal boxes, a difference shows as an extra piece sticking out, and the answer is usually read off once one box's value is known.

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LearnWhat it is, how to spot it, a worked example, and where it goes wrong.
Practice — 3-point ladder1 problem. Three in a row finishes it.0/3 in a row · 0/1 solved
Practice — 4-point ladder1 problem. Three in a row finishes it.0/3 in a row · 0/1 solved
Practice — 5-point ladderNo problems written at this tier yet.Nothing written at this tier yet
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

MOD-10Multi-step arithmetic word problems

In official papers

No indexed official paper question has been tagged with MOD-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.

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