The purpose of this research project was to investigate the effect of the Think Through Math (TTM) online tutorial on student achievement in mathematics and student self-perception in mathematics ability. The treatment group consisted of 140 fifth grade students who received general instruction and daily access to TTM. The control group consisted of 151 fifth grade students from the same district with similar demographics who received general instruction, but no access to TTM. In observing the results of achievement and self-perception in mathematics, the researcher discovered that the students using TTM outperformed and had a higher self-perception in mathematics than the students that did not use TTM. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]