The purpose of this study was to examine the effects of a vocabulary tutoring intervention with defining key vocabulary terms and algebraic problem-solving skills of students who struggle with mathematics. Literature shows that there is a need to further explore how students with mathematical learning difficulties learn mathematics vocabulary at the post-secondary level. The participants for this study included five college-aged students, 18 years or older, who self-identified as struggling with mathematics. Each participant completed two vocabulary tutoring sessions each week and complete layered-look books during each session. The layered-look books included the vocabulary word, definition, an example, and non-example. The dependent variable was the percentage of correct answers on a six-question test. Each test will contain three vocabulary short answer questions and three multiple-choice algebraic exercises. The researcher used a multiple probe across behaviors, replicated across participants design to determine what effect mathematics vocabulary tutoring has on a student's ability to define vocabulary terms and what effect mathematics vocabulary tutoring has on a student's algebraic problem solving. The study included three phases: baseline, vocabulary tutoring (intervention), and maintenance. The researcher followed a modeling and guided practice teaching strategy to tutor the student. Based on the results of this study, it was concluded that the vocabulary tutoring intervention did help students learn the vocabulary. Three of the five participants showed a functional relationship between the vocabulary intervention and defining key vocabulary words. However, the vocabulary tutoring intervention did not help participants with the algebraic problem-solving examples. None of the five participants had three demonstrations of effect. [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://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]