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Number & Arithmetic15
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Patterns & Sequences7
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Code is MIT. Problems, skills, and explanations are CC BY-NC-SA 4.0. Practice never requires an account and nothing here is paywalled.

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177 problems, every one written from scratch, every wrong answer carrying the mistake that produces it. 708 explanations in all.

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NUMNumber & Arithmetic
CNTCounting
GEOGeometry & Visualization
LOGLogic & Deduction
PATPatterns & Sequences
MODModeling & Word Problems
CFTContest Craft

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KA-0050
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Toma spent 4 euros, then spent half of what was left, and now has 6 euros. How much did she start with?
LOG-08Working backwardsalso MOD-06

Browse the problems — Kangaroo Atlas