Science teaches an understanding of natural phenomena. It aims to stimulate a child's curiosity in finding out why things happen in the way that they do. It teaches methods of enquiry and investigation to stimulate creative thought. FCJ pupils learn to ask scientific questions and begin to appreciate the way in which science will affect the future on a personal, national and global level.

At FCJ Primary we use a variety of teaching and learning styles in science lessons. Our principal aim is to develop pupils' knowledge, skills, and understanding. Sometimes, we do this through whole-class teaching, while at other times, we engage the pupils in an enquiry-based research activity. We encourage the pupils to ask, as well as answer, scientific questions.

The school participates in the annual Jersey Primary Schools Science Fayre where groups of primary school children prepare and present science projects. These are judged by a panel of teachers and awards are given accordingly.