Maths teacher Gareth Doherty, from Coláiste na Carraige, Carrick discusses how technology can be used to identify students’ prior knowledge in applied arithmetic. His fifth year students complete questions from student response system Socrative in their copies, and input answers using their phones or tablets. Students can work at their own pace and Gareth can instantly see which questions are problematic and which students require additional support. This feedback allows him to target his teaching to address common errors. Following class he creates a video using the ShowMe iPad app to provide additional support for challenging questions and shares this on his class blog so students can view it at home. Gareth discusses how technology can increase student engagement and also save time for teachers.