The recent research aims at knowing the effect of using a model of the constructive theory based on Cognitive Apprenticeship in order to reduce pupils' feeling with anxiety while studying math. The research sample includes 41 students at primary five studying at AL Gawharey primary school belonging to west Tanta educational department during the 1st term of the year 2019-2020. The quasi experimental method is used before and after the application. The aforementioned model is applied via a teacher's guide prepared by the researcher besides making a 23- statement scale to reduce math anxiety. These statements are distributed to 5 axes; each of them represents a situation having 2 options: positive and negative. Results show differences with statistical differences at level of ≤ 0.05. Consequently, that shows a statistically significant difference between means of pupils' grades enrolled in the experimental group at the favor of the post application. T-value mounts 18,116which is statistically significant, whereas freedom degree mounts40.