In it, there are explanations of practical mathematics such as how to use the abacus and the surveying method, as well as mathematical games such as 'mamakodate' and 'nezumisan.'
そろばんの使用法や測量法といった実用数学に加え、「継子立て」や「ねずみ算」といった数学遊戯が紹介されている。