This paper explores the relationship among ICT infrastructure (i.e., computing devices and Internet), one-to-one computing program and student ICT activities in school. It also looks into the differences of how ICT is being used in the teaching of English, mathematics and science at the elementary school level in relation to the availability of computing devices, Internet connection and one-to-one program. A total of 360 Grade 5 students from three schools (120 students from each school) in the western part of Singapore participated in a questionnaire adapted from the Program for International Student Assessment (PISA) ICT Familiarity Component for Student Questionnaire regarding students' ICT use. One of the participating schools has implemented a school-based one-to-one computing program for all its students for the past nine years, with the school providing the necessary computing devices for all its Grade 1 to 3 students and a student computer ownership program to encourage all its Grade 4 students to procure their own computing devices to be used till completion of elementary education at Grade 6. The regression analyses suggest that how ICT is being used plays a more significant role in predicting the frequency of ICT use for the various subject areas than ICT infrastructure and one-to-one computing program. Further analysis also reveals that one-to-one computing program and availability of computing devices have a significant interaction effect on the frequency of ICT usage for English but not for mathematics and science--the presence of computing devices seem to have an impact for the usage of ICT for English but not the other two subject areas. The findings concur with earlier studies that there are differences in frequency and how ICT is being used in the teaching of English, mathematics and science.