This practical learning module is aimed at helping nurses learn, practise and update their numerical skills to ensure the safe administration of intravenous (IV) medication. The mathematical, procedural and conceptual factors that can result in medication errors are examined and opportunities to practise skills and to reflect upon personal competence are offered. Disclaimer Please note that information provided by RCNi Learning is not sufficient to ensure competence in the skill. Assessment of competence should take place in line with local practice. Practice should always align with local protocols and procedures, latest guidelines and any regulatory code. All modules should currently be viewed together with available national and local Covid-19 guidelines. For advice, go to www.rcn.org.uk/covid-19/rcn-position