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Number & Arithmetic15
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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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1–2
3–4
5–6
7–8
9–10
11–12

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

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2 problemsClear all filters

KA-0106
5 points, difficulty 3 of 3Level 5–6not yet calibrated
A machine turns 3 into 7, 5 into 11 and 8 into 17. What does it turn 12 into?
PAT-07Inferring a rule from examplesalso PAT-05, CFT-03
KA-0138
5 points, difficulty 3 of 3Level 3–4not yet calibrated
Squares of dots grow: 1 dot, then 4, then 9, then 16. How many dots are in the seventh square?
PAT-04Growth patterns and figurate numbersalso PAT-02, GEO-01

Browse the problems — Kangaroo Atlas