Find 2–3 other students in your center who are also on Level O. Each of you tries the same 5 problems. Compare answers. If three of you get the same answer, it is likely correct. If one person is different, you have a debate that leads to learning.

In a Kumon center, the instructor uses the Solution Book to grade. But the student is expected to correct their own errors before submitting. This means the Solution Book must be used at home, under parental supervision, to identify mistakes. The ethical tightrope is real.

Topics covered in Level O include: