Abstract/Overview This study investigated the influence of classroom instructional resources on pre-primary learners’ mastery of number activity concepts in public preschool schools in Embakasi Sub County Nairobi County. The target population comprised of the 25 public preschools, 75 pre-school teachers, 25 centre managers, 3 Sub County coordinator and 1536 preschool learners. A sample size of 461 learners, 75 pre-primary teachers,25 Centre managers and 3 Sub County Coordinators were co...