If you type "Kumon Level O solution book" into Google or Amazon, you will encounter a frustrating reality:

Kumon North America does not sell standalone answer keys to the general public. Here is why:

And tomorrow, she’d ask Mr. Tanaka for the next set of problems—not the answers, but the beautiful, difficult questions.

Bring your half-finished work to the center. Instructors are trained to identify exactly where you broke the chain. They will open their solution book, point to Line 3 of the solution, and ask: "Why do you think we added ( +C ) here?"