The purpose of this study was to examine the effect of a response-to-intervention on the first
graders elementary school students at risk for mathematics learning disabilities. The subjects in this
study were 144 first graders elementary school students. After a first-stage typical teaching was
provided for them in 12 sessions during a four-week period of time, they took an academic
achievement test in number and operation, and another test was carried out by focusing on the CBM.
And then the children who ranked in the lowest 16 percent and were eventually at risk for
mathematics learning disabilities were selected. Out of the selected children, a second-stage teaching
was offered for 18 children at risk for mathematics learning disabilities in 48 sessions during a
12-week period of time. As for data analysis, statistical data on mean and standard deviation were
obtained to test the effect of the teaching on their performance, and a linear analysis, one of
regression analysis methods, was utilized to check their slope to find out their level of progress. The
findings of the study were as follows: First, The first-stage typical teaching was added by the
performance and progress of and then the children who ranked in the lowest 16 percent and were
eventually 18 children at risk for mathematics learning disabilities were selected. Second, the
two-stage small-group teaching had a significant effect on the number and operation skills of the
children at risk for mathematics learning disabilities.