This study aimed to determine the effectiveness of concrete manipulatives in the problem solving performance and mathematics achievement of high school students.The participants of the study were the 36 Grade 7 high school students of Pavia National High School during the second grading period of the school year 2015-2016. These students were ranked from highest to lowest based on their grades in the first quarter. The groups were chosen through purposive random sampling. Means and standard deviation were employed for descriptive analyses of the study. Wilcoxon Signed Rank Test and Spearman Rank Correlation Coefficient were used for inferential statistics. The statistical computations were processed via Statistical Package for Social Science (SPSS) software. Finding showed that the problem solving and the mathematical achievement of the participants improved after intervention. Concrete manipulatives are effective tools in helping high school students on their problem solving skills. The results also show that there is no significant relationship between the problem solving performance and mathematical achievement of high school students.