Аннотация:The study examines the features of the number representation in the test of the number line from 0 to 1000 among schoolchildren in grades 1–11. For schoolchildren in grades 1–6, both linear and logarithmic models of number representation are identified; after grade 6, all schoolchildren are characterized by a linear model. The linear model, on average, explains the greater percentage of the answer variance in the number line test over the entire training period. An improvement in the average accuracy of number representation in middle and high school can occur due to changes in the parameters of the linear model and a decrease in interindividual differences in the estimated parameters.Keywords: number line, symbolic representation of quantity, linear model of number representation, logarithmic model of number representation