There were several schools of mathematics in Japan during the Edo period. Each school had its way of writing formulas and expressing mathematics differently. There are few written records of how students learned mathematics during the Edo period, but one small school, the Shisei-Sanka school, has left behind a rare book describing how students learned.
I will introduce the mathematics studied there and the problems published in the sangaku (votive mathematical tablet) to show how the Japanese people were familiar with mathematics then. In addition, each school had a license with several levels of teaching mathematics. One of Licenses is also presented.