The current research aimed to reveal the effectiveness of teaching science using creative habits of mind in developing problem-solving skills and reducing mental wandering among fifth-grade primary school pupils, and used the descriptive & experimental approach. The content of the unit on nutritional Relations between Living Organisms from the science curriculum for the fifth grade of primary school was studied according to creative habits of mind. A problem-solving skills test was prepared and its skills included defining the problem, imposing hypotheses, testing hypotheses, arriving at a solution, and a measure of mental wandering. Its dimensions included mental wandering related to the science course topics & mental wandering not associated with the topics. The pre & post-research tools were applied to the research group, and the research relied on an experimental design with two groups, the control group, which consisted of 30 pupils, and the experimental group which consisted of 30 pupils. The research results resulted in a statistically significant difference at the level of (0.05) between the average scores of the experimental group and the control group in the post-application of the problem-solving skills test as a whole and its sub-skills in favour of the experimental group. There is a statistically significant difference at the level of (0.05) between the average scores of the experimental group in the pre & post-applications of the problem-solving skills test as a whole and in its sub-skills individually in favour of the post-application. There is a statistically significant difference at the level of (0.05) between the average scores of the experimental group and the control group in the post-application of the mental wandering scale as a whole and its sub-dimensions separately in favour of the experimental group. There is a statistically significant difference at the level of (0.05) between the average scores of the experimental group in the pre & post-application of the mental wandering scale. As a whole and in its sub-dimensions individually, in favour of the post-application.There is no correlation between problem-solving skills and mental wandering among fifth-grade primary school pupils. Key words: Creative Habits of Mind - Problem Solving Skills - Mental Wandering