In this paper, using samples of high school students in Japan (n=868), we examine how lottery choices under risk are affected by numeracy, grade, or gender. Its Features are two points. First, it converts lottery choices of samples in continuous variables by using the principal component analysis and factor analysis. Second, it is estimated by dividing the samples into several subgroups. In this issue, the main conclusions obtained in empirical analysis are as follows. First, high basic academic skills students show a risk-loving choice in the gain situation compared with low basic academic skills students. Second, schoolgirls show a more risk-averse choice in the gain situation than schoolboys. Third, when it is low prize money, high school students result of a more risk-loving choice compared with high prize money.