Lydia Gesare Ondieki, Benson Odongo, and Mary Anyango Onditi Jaramogi Oginga Odinga University of science and Technology P.O. Box 210 – 40601 Bondo – Kenya Author email:lydia.gesare@yahoo.com Abstract 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….