There has been increased attention to the method for identifying students with learning disabilities
with an RTI framework, where students are identified as learning disabilities if their level and rate of
growth are substantially lower than their peers. However, little has been known about the prevalence
of students with learning disabilities within an RTI model. Therefore, the main purpose of this
current study was to examine what percentage of the students in our school have math disabilities.
Especially, the use of latent growth modeling allowed for providing the growth rate and reliability of
curriculum based measurement in math. Based on these figures, it was possible to estimate the
prevalence of students with math disabilities. This study showed that the prevalence figure estimated
by latent growth modeling was 1.49%. In addition, the results from this study supported the view
that an RTI model is an valid and reliable approach to be used for identifying students with
learning disabilities.