The aim of this research is to develop pre-arithmetic skills for children of the first level in kindergarten, which are (attention and observation, arrangement and order, recognition of shapes, sizes and patterns, sorting and classification, one-to-one symmetry, comparison and measurement, statistics and probability) through a program based on educational games in the light of Montessori Method And the answer to the main question, which is what is the effectiveness of using educational games in developing some pre-arithmetic skills for children of the first level in kindergarten in the light of Montessori Method, Where the researcher used the experimental approach with a quasi-experimental design for one experimental group on a sample of first-level children (4-5 years), and the number of children reached (40) boys and girls (15) males and (25) females. The research tools were determined in the scale of pre-calculation skills for the kindergarten child (prepared by the researcher), and this scale was applied pre-, post- and follow-up after making sure of its validity and calculating its stability, and the educational games program in the light of Montessori Method (prepared by the researcher).One of the most important results was that there were statistically significant differences at the 0.01 level between the mean scores of the experimental research sample members in the tribal and remote measurements of the pre-calculation skills scale for the kindergarten child (dimensions and total score) in favor of the post-measurement, and there were statistically significant differences at the 0.01 level between The mean scores of the experimental research sample members (males and females) in the post-measurement of the pre-calculation skills scale for the kindergarten child (dimensions and total score) in favor of females. The research recommended the necessity of holding training courses for female teachers to train them on how to prepare and use educational games in the light of the Montessori approach, and the need to pay attention to developing pre-arithmetic skills before starting to teach numbers and arithmetic operations for the kindergarten child.