Society's perception of women in the field of mathematics is slowly changing, but strong social messages remain that technology, mathematics, and science are nontraditional arenas for girls, and girls self-select out of these areas. This booklet is directed to both families and educators, because the work of encouraging girls in math begins at birth and continues throughout the school years. The purposes of this booklet are to: (1) provide information about the harmful and lasting effects on girls and boys of gender-role stereotyping; (2) help administrators, teachers, and families as they develop ways to reduce gender-role stereotyping and encourage K-12 girls in math; and (3) offer educators and families the most current strategies that work to encourage both girls and boys in math. Section titles are: "Stereotyping and Math,""Creating a Good Math Climate," and "Six Classroom Strategies." Contains 36 references and a list of 14 resource organizations. (MKR)