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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
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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