St Peter Chanel developed a whole-school initiative to concentrate on teaching mathematics through the proficiencies. The entire staff engaged with the analysis of the school data to find areas where the focus of teaching was to occur. The initiative included all teachers having a collective responsibility for the learning of each student. With the leadership of a numeracy key teacher, teachers formed professional learning teams to unpack the proficiencies to be included in their learning programs and to underpin their formative assessment. Open-ended problems were used throughout the school where students could engage with challenging concepts.