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The official policy of Kumon North America (and most global branches) is that They are intended for use by instructors and assistants at Kumon centers.

Sometimes, the Kumon examples provided on the worksheets aren't enough for a student to grasp a particularly abstract concept. Seeing the full derivation in the solution book can provide that "aha!" moment.

Kumon worksheets often have one correct answer but multiple methods. The Solution Book typically shows one—often the most direct or the one that aligns with previous Kumon examples. However, advanced students (and tutors) know that an alternate method (e.g., using an integrating factor vs. separation of variables) might be equally valid. The Solution Book thus becomes a reference standard , not an absolute authority.

Applications involving tangents, maxima and minima, and concavity.