The aim of this research is to study changes resulting from parents attending a study group designed by class teacher that include reading a chosen book and engaging in teacher¡¦s designated activities relating to grade 1 elementary school mathematics contents; and trying ideas at home with school children. By referring to literature she decided on a study group format and adopted equal interaction and co-operative discussion setting. The math contents are: Number (1-10); Knowing about Geometric Shapes, Classifications (Color, Shapes). Data collection included questionnaire about study group meetings, children¡¦s interviews, parents¡¦ interviews, teacher¡¦s diaries, video tapes of in-class activities. Analyzes of interviews is by Goldin (2000). The findings are four: through the above mentioned study group (1) parents upgraded themselves in math ability and in confidence and set goals relating to different age of children; (2) children were given the opportunities to learn in a variety of ways; (3) promoted parent-child interaction, especially at home; and, (4) enhanced parent-teacher relationships and stimulated creativity in teacher¡¦s instruction.