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This document reports on an experimental study that tested a model for enhancing mathematics teaching in five high school career and technical education (CTE) programs (agriculture, auto technology, business, marketing, health, and information technology) in the US. The model comprised a pedagogy and intense teacher professional development. Volunteer CTE teachers were randomly assigned to an experimental (n = 57) or control (n = 74) group. The experimental teachers worked with math teachers in communities of practice to develop CTE instructional activities that integrated more mathematics into the occupational curriculum. The research found that after one year of the math-enhanced CTE lessons, which took up an average of 10% of class time, the students in the experimental classrooms performed significantly better on two tests of math ability (the TerraNova and ACCUPLACER) and there was no negative effect on measures of their occupational/technical knowledge.