This paper examines the extent to which an intervention program on the use of practical work affected the following two variables: instructional techniques and mathematical ability. An attempt was made to correlate these two variables with age, educational attainment, and teaching experience to determine if there exists a relationship with and without the effect of the intervention. Differences and relationships between these two variables before and after the intervention were significant. However, these two variables were not correlated with age, educational attainment and teaching experience before and after the intervention. Generally, the results and discussion in this paper may serve as a catalyst from which necessary remediation and modification of school and in-service programs could emanate. (Contains 4 tables.)